Complex Sentence Structures in Welsh

In Brief

Advanced Welsh sentences often package several relationships into one structure: concession with er bod or er iddo/iddi, result with mor ... fel bod or nes, and open-ended conditions with beth bynnag. Formal writing also uses compact subordinate patterns such as y bydd, na all, and relative a more freely than everyday speech. The key is to learn each connector together with the form and mutation that normally follows it.

Overview

A complex sentence contains a main clause and at least one subordinate clause—a clause that depends on another part of the sentence for its full role. At C1, the challenge is no longer simply joining ideas with a “and” or ond “but.” You need to show exactly how one claim relates to another: it may be conceded, presented as a result, treated as true regardless of circumstances, or inserted as a comment on the surrounding statement.

Welsh does this through a combination of linking words, person-marked forms of bod “to be,” particles, mutation, and word order. English often relies on a finite clause after a conjunction: “although he was late.” Welsh may instead use a construction built around a verbal noun (the dictionary-like verb form), as in er iddo fod yn hwyr. A word-for-word English template is therefore unreliable.

These structures occur in careful speech, journalism, essays, public language, and literature. Some belong comfortably to neutral Welsh; others, especially compact forms with inflected verbs and literary particles, are more typical of formal writing. Mastery means both producing clear multi-clause sentences and recognising when a writer has chosen a denser register.

How It Works

Concession with er

A concessive clause admits a fact without allowing it to change the outcome: “although X, Y still happened.” Welsh has two important patterns.

The first uses er bod followed by a full clause:

er bod + subject + predicate, main clause

• Er bod y siop ar gau, roedd rhywun y tu mewn. “Although the shop was closed, someone was inside.”
• Er bod hi'n hwyr, parhaodd y cyfarfod. “Although it was late, the meeting continued.”

When the subordinate subject is a pronoun, careful Welsh often marks that person on bod with a possessive form. These forms are worth learning as complete chunks.

Person	Form after er	Basic sense
I	er fy mod i	although I am/was
you, singular informal	er dy fod di	although you are/were
he	er ei fod e/o	although he is/was
she	er ei bod hi	although she is/was
we	er ein bod ni	although we are/were
you, plural or polite	er eich bod chi	although you are/were
they	er eu bod nhw	although they are/were

The changes bod → mod/fod are mutations caused by the preceding possessive form. The pronouns i, di, hi, and so on make the reference explicit, especially in speech. The time reference usually comes from the wider sentence and from markers such as wedi; bod itself does not give a simple English-style “was” ending here.

A second, compact pattern uses er + i with an inflected preposition (a preposition whose ending identifies the person), followed by a verbal noun:

er + iddo/iddi/inni/iddynt + verbal noun

• Er iddo fod yn hwyr, cafodd groeso. “Although he was late, he received a welcome.”
• Er iddi golli'r map, daeth o hyd i'r tŷ. “Although she lost the map, she found the house.”

Here iddo means roughly “to him,” but the whole construction corresponds to English “although he ...,” not “although to him.” The verbal noun often undergoes soft mutation: bod → fod, colli → golli. This pattern is concise and especially common in careful or formal prose.

Do not confuse these patterns with er gwaethaf “despite.” Er gwaethaf normally introduces a noun phrase, not a complete clause: er gwaethaf y glaw “despite the rain.”

Result clauses: mor ... fel, cymaint ... fel, and nes

A result clause states the consequence produced by a degree or situation. In grammatical descriptions, it may be called a “consecutive clause”; here consecutive means “expressing a consequence,” not merely “coming next.”

The most useful pattern is:

mor + adjective/adverb + fel bod + result

• Roedd hi mor oer fel bod yr afon wedi rhewi. “It was so cold that the river had frozen.”

With a negative result, fel na or fel nad may introduce an inflected verb. Nad is used before a vowel sound in forms such as nad oedd:

• Roedd y gerddoriaeth mor uchel fel na chlywais i'r ffôn. “The music was so loud that I did not hear the phone.”
• Roedd y broblem mor gymhleth fel nad oedd ateb cyflym. “The problem was so complex that there was no quick answer.”

For quantity, use cymaint ... fel “so much/so many ... that.” Formal prose can front this element for emphasis:

• Cymaint oedd y sŵn fel na allai neb ganolbwyntio. “So great was the noise that nobody could concentrate.”

Nes presents the endpoint reached, often like “until” or “to the point that”:

• Roedd e mor flinedig nes iddo syrthio i gysgu. “He was so tired that he fell asleep.”

By contrast, felly “therefore/so” and o ganlyniad “as a result” connect independent statements. They express consequence, but they do not build the same subordinate structure as fel bod.

Content clauses after a framing expression

A content clause fills in what is true, hoped, clear, or possible. It works rather like a noun in the larger sentence: compare “the truth is this” with “the truth is that we cannot afford it.” This develops the noun-clause patterns learned earlier.

In formal Welsh, an affirmative clause with an inflected verb is often introduced by y or yr:

• Y gobaith yw y bydd y gwaith wedi'i orffen erbyn nos Wener. “The hope is that the work will have been finished by Friday evening.”

A negative clause may use na or nad:

• Y gwir amdani yw na allwn ni fforddio hynny. “The truth is that we cannot afford that.”
• Y broblem yw nad oes digon o amser. “The problem is that there is not enough time.”

Here na is not simply the ordinary spoken negative word ddim. It is a clause-linking negative particle, and it may trigger soft mutation: gallwn → allwn. Before a vowel, including oedd and oes, the form is normally nad.

More conversational Welsh often prefers a bod clause or breaks the information into two sentences. The formal patterns are nevertheless essential for reading reports, essays, and public documents.

“Whatever,” “whoever,” and “however”

Welsh builds free-choice expressions with an interrogative word plus bynnag, followed by a dependent clause. “Free-choice” means that the identity or circumstances do not affect the result.

Meaning	Welsh frame	Example opening
whatever	beth bynnag a ...	Beth bynnag a ddywedwch ...
whoever	pwy bynnag a ...	Pwy bynnag a ddaw ...
wherever	lle bynnag y ...	Lle bynnag y byddwch ...
however difficult	pa mor ... bynnag y ...	Pa mor anodd bynnag y bo ...

The relative particle a is followed by soft mutation where the following consonant can mutate: dywedwch → ddywedwch, daw → ddaw. Other frames use y. In elevated Welsh, bo is a present subjunctive form of bod—a form used here for an open or non-specific situation: pa mor anodd bynnag y bo'r dasg “however difficult the task may be.”

Parenthetical insertions

A parenthetical insertion is a short comment placed inside a larger sentence. It may show the speaker's attitude, limit a claim, identify a source, or organise the argument. If it can be removed while leaving the basic sentence intact, commas, dashes, or brackets normally mark its boundaries.

Common insertions include:

• a dweud y gwir — to tell the truth
• hyd y gwn i — as far as I know
• yn ôl pob tebyg — in all probability
• fel y gwelsom — as we saw
• hynny yw — that is

Compare Ni fydd y cynnig, hyd y gwn i, yn newid “The proposal, as far as I know, will not change.” The insertion does not replace a conjunction between clauses; it comments on the certainty of the main statement. In long formal sentences, punctuation is structural guidance, not decoration.

Examples in Context

Welsh	English	Note
Er fy mod i wedi darllen yr adroddiad, dydw i ddim wedi dod i gasgliad eto.	Although I have read the report, I have not reached a conclusion yet.	Person-marked bod clause
Er ei bod hi'n bwrw glaw, aethon ni am dro.	Although it was raining, we went for a walk.	Concession does not change the outcome
Er iddo fod yn hwyr, cafodd groeso.	Although he was late, he received a welcome.	Compact er iddo + verbal noun
Er iddynt golli'r cyfle cyntaf, llwyddon nhw yn y diwedd.	Although they missed the first opportunity, they succeeded in the end.	Formal plural pattern
Roedd y blwch mor drwm fel na allwn i ei godi.	The box was so heavy that I could not lift it.	Negative result with fel na
Roedd yr esboniad mor glir fel bod pawb wedi deall.	The explanation was so clear that everyone understood.	Result with fel bod
Cymaint oedd ei syndod fel na ddywedodd air.	So great was his surprise that he did not say a word.	Fronted formal result pattern
Roedd hi mor flinedig nes iddi syrthio i gysgu ar y soffa.	She was so tired that she fell asleep on the sofa.	Endpoint expressed by nes iddi
Y gwir amdani yw na allwn ni fforddio hynny.	The truth is that we cannot afford that.	Negative content clause
Y gobaith yw y bydd y trên yn cyrraedd mewn pryd.	The hope is that the train will arrive on time.	Formal affirmative content clause
Beth bynnag a ddywedwch, fydda i ddim yn newid fy meddwl.	Whatever you say, I will not change my mind.	Free-choice frame with relative a
Pwy bynnag a ddaw gyntaf fydd yn cael dewis.	Whoever comes first will get to choose.	Open reference to a person
Pa mor anodd bynnag y bo'r daith, rhaid inni barhau.	However difficult the journey may be, we must continue.	Elevated bo
Ni fydd y penderfyniad, hyd y gwn i, yn cael ei gyhoeddi heddiw.	The decision, as far as I know, will not be announced today.	Parenthetical limitation
Roedd y cynllun—fel y gwelsom eisoes—yn dibynnu ar gyllid ychwanegol.	The plan—as we have already seen—depended on additional funding.	Inserted cross-reference

Common Mistakes

Treating er like English “although” in every pattern

• Wrong: Er mae hi'n hwyr, arhoson ni.
• Right: Er ei bod hi'n hwyr, arhoson ni.
• Also right: Er bod hi'n hwyr, arhoson ni.
• Why: Welsh normally uses a bod construction after concessive er, not an ordinary independent mae clause.

Using the wrong person-marked form of bod

• Wrong: Er ei fod hi'n brysur, atebodd hi.
• Right: Er ei bod hi'n brysur, atebodd hi.
• Why: Ei fod e/o refers to “him,” while ei bod hi refers to “her.” The mutation distinguishes these otherwise similar possessive forms.

Translating every English “that” as bod

• Wrong: Y gwir yw bod allwn ni ddim fforddio hynny.
• Right: Y gwir yw na allwn ni fforddio hynny.
• Alternative: Y gwir yw ein bod ni ddim yn gallu fforddio hynny.
• Why: A formal negative clause with an inflected verb uses na/nad. A bod clause requires its own person marking and predicate structure. English “that” does not correspond to one fixed Welsh word.

Forgetting mutation after relative a

• Wrong: Beth bynnag a dywedwch ...
• Right: Beth bynnag a ddywedwch ...
• Why: Direct relative a normally triggers soft mutation, so d becomes dd here.

Confusing result with purpose

• Wrong meaning: Roedd hi'n siarad yn araf er mwyn i bawb ei deall if you mean that understanding actually occurred as a result.
• Result: Roedd hi'n siarad mor glir fel bod pawb wedi'i deall.
• Purpose: Roedd hi'n siarad yn araf er mwyn i bawb ei deall.
• Why: Er mwyn i gives an intention (“in order that”); mor ... fel bod gives the consequence that followed.

Losing the sentence inside too many insertions

• Awkward: Bydd y pwyllgor, hyd y gwn i, ar ôl trafodaeth hir, fel y dywedodd y cadeirydd, yn penderfynu yfory.
• Clearer: Hyd y gwn i, bydd y pwyllgor yn penderfynu yfory ar ôl trafodaeth hir. Dyna a ddywedodd y cadeirydd.
• Why: Correct grammar does not guarantee readable prose. If several comments interrupt the subject and verb, split the sentence.

Usage Notes

Neutral versus formal Welsh. Er bod, mor ... fel bod, and short parentheticals are not restricted to literature; they are useful in ordinary careful Welsh. Forms such as er iddo, y bydd after an abstract framing noun, fronted cymaint oedd ..., and subjunctive bo give prose a more formal or literary texture. They may occur in prepared speech, but a spontaneous conversation often chooses a bod clause, a shorter connector, or two separate sentences.

Pronoun variation. This article shows both southern e and the widely used forms i, di, hi, ni, chi, nhw. Northern usage often has o for “he.” The syntax does not change: er ei fod o and er ei fod e represent the same underlying pattern. Follow one consistent regional model in your own speech while learning to recognise the other.

Negative forms. In formal dependent clauses, na/nad carries both linkage and negation. In conversational bod clauses, ddim is common: Dw i'n meddwl nad yw e yma is formal-standard, while Dw i'n meddwl bod e ddim yma is a familiar spoken type. Register, dialect, and the verb pattern all affect the choice; do not simply insert ddim into every formal clause.

Punctuation. A subordinate clause placed first is usually followed by a comma, as in Er ei bod hi'n hwyr, arhoson ni. A short clause after the main clause may not need one. Parenthetical material takes paired punctuation: two commas or two dashes. Dashes make the interruption stronger; brackets make it feel more supplementary.

Beyond the Basics: Literary Subordination

Formal Welsh can place more grammatical work on small particles than English does. Three contrasts are especially useful when reading advanced prose.

First, a and y are not interchangeable general words for “that.” Relative a commonly links a directly related subject or object and triggers soft mutation: yr hyn a welodd hi “what she saw.” Y introduces other dependent patterns, including lle y byddant yn aros “where they will stay.” In natural modern usage, particles may sometimes be omitted or their distribution may vary by construction, but deliberately swapping them is not a safe simplification.

Second, literary Welsh preserves dependent and subjunctive forms that everyday speech often paraphrases. Bo in pa mor anodd bynnag y bo presents an open possibility elegantly. You do not need to force bo into conversation; recognition is more important at first. Likewise, rhaid inni barhau is a compact formal alternative to more analytic spoken phrasing with an explicit pronoun.

Third, a writer may front a subordinate element for rhetorical balance:

• Er mor gryf oedd y dystiolaeth, gwrthodwyd y cais. — “Strong though the evidence was, the application was refused.”
• Cymaint oedd y galw fel y bu'n rhaid agor ail sesiwn. — “Such was the demand that a second session had to be opened.”
• Yr hyn na ddeallodd neb oedd pam y gadawodd. — “What nobody understood was why he left.”

These patterns concentrate attention on concession, degree, or the unknown element. They are powerful in essays and narrative, but repeated fronting can sound heavy. A strong C1 writer alternates dense subordination with shorter main clauses so that the logical structure remains visible.

Practice Tips

1. Build one pattern at a time. Take a simple pair such as Roedd hi'n flinedig. Parhaodd hi. Rewrite it with er ei bod, then change the person: er fy mod i, er ein bod ni, er eu bod nhw. This trains both syntax and mutation.
2. Label the relationship before translating. When reading a long sentence, mark each clause as concession, result, content, free choice, or parenthetical comment. Then identify its connector. This prevents the English word “that” from hiding several different Welsh structures.
3. Practise register pairs. Write a formal version and a conversational version of the same message. For example, compare Y broblem yw nad oes digon o amser with a shorter spoken explanation. Read both aloud and notice which forms suit a report, a presentation, or a chat.

Related Concepts

• Prerequisite: Noun Clauses — provides the core bod clauses on which many of these structures build.
• Next step: Discourse Grammar and Pragmatics — develops how clause choice, focus, hedging, and stance shape whole conversations and texts.