Noun Clauses in Welsh

In Brief

After verbs such as meddwl “think,” gwybod “know,” and dweud “say,” Welsh commonly introduces a complete idea with bod: Dw i'n meddwl bod hi'n iawn means “I think (that) she is right.” With pronoun subjects, you will also meet personal patterns such as fy mod i, dy fod di, ei fod e, and ei bod hi. Do not simply put an independent clause beginning with mae after the first verb.

Overview

A noun clause is a clause—a group of words containing its own subject and predicate—that fills a slot normally available to a noun. In “I know the answer,” the answer is a noun phrase; in “I know that she is here,” the bold part is a noun clause. It is what is known, thought, believed, remembered, or said.

At B1, this pattern lets you move beyond strings of short statements. Instead of Mae hi'n brysur. Dw i'n meddwl hynny (“She is busy. I think that”), you can say Dw i'n meddwl ei bod hi'n brysur (“I think that she is busy”). Welsh often uses the verb-noun bod—the dictionary form meaning “be”—where English uses that followed by a finite form such as is or are.

This is not the same as a relative clause. A relative clause describes a noun: y dyn sy'n byw yma (“the man who lives here”). A noun clause is itself the content of a thought or statement: Dw i'n gwybod bod y dyn yn byw yma (“I know that the man lives here”).

How It Works

The basic frame

The usual structure is:

main clause + bod clause

• Dw i'n meddwl + bod hi'n iawn → Dw i'n meddwl bod hi'n iawn.
• Mae Siân yn gwybod + bod y drws ar agor → Mae Siân yn gwybod bod y drws ar agor.

The first clause contains the verb of thinking, knowing, saying, discovering, hoping, or perception. The bod clause supplies its content.

Type of subject inside the noun clause	Pattern	Example	Meaning
Noun or name	bod + subject + predicate	bod Gareth yn gweithio	that Gareth is working
Transparent pronoun pattern	bod + pronoun + predicate	bod hi'n iawn	that she is right
Personal pronoun pattern	possessive form + mutated bod + reinforcing pronoun	ei bod hi'n iawn	that she is right

The transparent form bod hi... in the concept's core example is common, especially in speech. The personal forms are also extremely important and are frequent in careful speech and writing. Learn to understand both rather than treating one as the only possible pattern.

Personal forms with pronouns

Welsh often marks the subject of bod with a possessive word before it and repeats the person with a pronoun after it. That possessive word triggers mutation (a regular change to the first consonant of the following word) in some persons.

Person	Personal bod form	Example meaning
I	fy mod i	that I am
you, singular familiar	dy fod di	that you are
he	ei fod e/fo	that he is
she	ei bod hi	that she is
we	ein bod ni	that we are
you, plural or polite	eich bod chi	that you are
they	eu bod nhw	that they are

The forms are easier to remember when you see why they differ:

• fy causes nasal mutation, so bod becomes mod;
• dy and masculine ei cause soft mutation, so bod becomes fod;
• feminine ei is associated with aspirate mutation, but initial b does not change under that mutation, so it remains bod;
• ein, eich, and eu leave the initial b unchanged here.

The final pronoun—i, di, e/fo, hi, ni, chi, nhw—makes the subject clear and is normal in modern usage. The two third-person forms deserve special attention: ei fod e/fo means “that he is,” but ei bod hi means “that she is.”

Although learner descriptions sometimes call these “conjugated forms of bod,” their visible shape comes from the possessive marker plus mutation. Treat each whole expression as a reusable chunk.

What follows bod

The internal structure resembles other forms of bod. Use yn before a verbal noun (the dictionary form used for an activity), an adjective, or many noun predicates. With locations and many adverbial expressions, there is no linking yn before the expression itself.

Meaning	Pattern	Example
ongoing action	bod + subject + yn + verbal noun	bod y plant yn chwarae — that the children are playing
quality or state	bod + subject + yn + adjective	ei fod e'n flinedig — that he is tired
identity or role	bod + subject + yn + noun	fy mod i'n athro — that I am a teacher
location	bod + subject + location	bod hi yma — that she is here
completed action	bod + subject + wedi + verbal noun	eu bod nhw wedi gadael — that they have left

Remember that yn contracts after a vowel: hi + yn becomes hi'n, and i + yn becomes i'n. The mutation rules that normally follow linking yn still apply: blinedig becomes flinedig in ei fod e'n flinedig.

Common verbs before a noun clause

Useful triggers include:

• meddwl — think
• gwybod — know
• dweud — say
• credu — believe
• cofio — remember
• sylweddoli — realise
• clywed — hear
• gweld — see
• gobeithio — hope

English can omit that: “I think she is ready.” Welsh still needs a structure that marks the second idea as dependent, normally a bod pattern here: Dw i'n meddwl ei bod hi'n barod. Copying English word order and inserting mae hi does not produce the standard construction.

Time: let context help, but mark it when needed

A personal bod clause does not always display the same tense distinctions as an independent clause. The tense of the first verb and the surrounding context often guide the interpretation:

• Dw i'n gwybod ei bod hi'n gweithio. — “I know that she is working.”
• Dwedodd hi ei bod hi'n gweithio. — “She said that she was working.”

The embedded form is the same, while English changes is to was. Welsh can make time more explicit when necessary. Wedi marks a completed action: Dw i'n gwybod eu bod nhw wedi cyrraedd (“I know that they have arrived”). For clearly future content, a finite dependent clause with y bydd: Dw i'n meddwl y bydd hi'n bwrw glaw yfory (“I think it will rain tomorrow”). These patterns matter increasingly in reported speech.

Negative content

For a negative noun clause, careful Welsh commonly uses na/nad plus an appropriate form of the verb. Use nad before a vowel sound, as in nad yw and nad oedd:

• Dw i'n gwybod nad yw hi yma. — “I know that she is not here.”
• Sylweddolon ni nad oedd y siop ar agor. — “We realised that the shop was not open.”
• Mae e'n dweud na fydd y trên yn hwyr. — “He says that the train will not be late.”

Keep the scope of the negative clear. Dw i ddim yn meddwl ei fod e'n dod means “I don't think that he is coming”: the thinking is negated. Dw i'n meddwl nad yw e'n dod means “I think that he is not coming”: the content is explicitly negative. English often treats these as close in everyday conversation, but the grammatical focus differs.

Examples in Context

Welsh	English	Note
Dw i'n meddwl bod hi'n iawn.	I think that she's right.	Transparent bod + pronoun pattern
Mae e'n gwybod fy mod i yma.	He knows that I am here.	First person: fy mod i
Dwedodd hi ei bod hi'n mynd.	She said that she was going.	Feminine third person; past understood from context
Wyt ti'n credu bod y bws yn hwyr?	Do you think that the bus is late?	Noun subject after bod
Dw i'n gwybod dy fod di'n brysur.	I know that you are busy.	Familiar singular “you”
Mae'r athro'n dweud ei fod e'n bwysig.	The teacher says that it is important.	Masculine ei fod; e refers to the matter
Rydyn ni'n gobeithio ein bod ni ar y ffordd iawn.	We hope that we are on the right track.	First-person plural
Dw i'n falch eich bod chi yma.	I'm glad that you are here.	eich bod chi after an adjective expression
Clywais i eu bod nhw wedi symud i Gaerdydd.	I heard that they had moved to Cardiff.	wedi marks the earlier completed event
Sylweddolodd Mari fod y drws ar agor.	Mari realised that the door was open.	bod is soft-mutated after the literary past verb pattern
Dw i'n gwybod nad yw hi'n cytuno.	I know that she does not agree.	Negative present content
Dwedodd e nad oedd digon o amser.	He said that there was not enough time.	Negative past content
Dw i ddim yn meddwl ei fod e'n barod eto.	I don't think that he is ready yet.	Negative main clause
Maen nhw'n credu y bydd y cynllun yn gweithio.	They believe that the plan will work.	Explicit future with y bydd

The example Sylweddolodd Mari fod... shows a further mutation pattern: in more literary or formal constructions, an affirmative clause after a past-tense verb may begin with soft-mutated fod. At B1, prioritise recognising it; the everyday bod and personal patterns will carry most conversations.

Common Mistakes

Putting an independent mae clause after the first verb

• Wrong: Dw i'n meddwl mae hi'n iawn.
• Right: Dw i'n meddwl bod hi'n iawn.
• Also right: Dw i'n meddwl ei bod hi'n iawn.
• Why: Mae hi'n iawn can stand alone, but the content after meddwl is normally marked as a dependent clause with bod.

Using one unchanged form for every pronoun

• Wrong: Mae e'n gwybod fy bod i yma.
• Right: Mae e'n gwybod fy mod i yma.
• Why: Fy causes nasal mutation: bod becomes mod. Learn fy mod i as one unit.

Confusing “he” and “she”

• Wrong: Dwedodd hi ei fod hi'n mynd.
• Right: Dwedodd hi ei bod hi'n mynd.
• Why: Use ei fod e/fo for “that he is” and ei bod hi for “that she is.” The repeated ei looks identical, but the mutation and final pronoun reveal the gender.

Dropping linking yn

• Wrong: Dw i'n gwybod ei bod hi blinedig.
• Right: Dw i'n gwybod ei bod hi'n flinedig.
• Why: An adjective predicate normally needs linking yn, contracted to 'n after hi. It also causes soft mutation in blinedig → flinedig.

Treating bod as if it always meant present time

• Wrong interpretation: assuming Dwedodd hi ei bod hi'n sâl can only mean “She said that she is ill.”
• Better reading: “She said that she was ill,” unless the context shows that the illness continues now.
• Why: The first verb and context can set the time of the embedded bod clause. Add wedi, nad oedd, or y bydd when the sequence of events needs to be explicit.

Putting the negative in the wrong clause

• Unclear for the intended meaning: Dw i ddim yn gwybod ei bod hi yma when you mean “I know that she isn't here.”
• Right: Dw i'n gwybod nad yw hi yma.
• Why: Negating gwybod gives “I do not know”; negating the embedded content with nad yw gives “I know that she is not.”

Usage Notes

Spoken forms vary. In southern varieties, e is common for “he”; in northern varieties, you will often hear fo. Thus ei fod e and ei fod fo express the same person. You may also hear reduced forms in rapid speech, including a weakened or omitted possessive element. Use full forms such as fy mod i and eu bod nhw in your own careful writing, while training your ear to recognise spoken reductions.

Both bod hi and ei bod hi occur. The shorter transparent pattern is especially accessible in conversation, while the personal pattern clearly encodes the subject and is well established across registers. Do not “correct” the supplied example Dw i'n meddwl bod hi'n iawn to mean that only ei bod hi is grammatical.

English that is not a word-for-word guide. Sometimes English includes that, sometimes it omits it, and sometimes a natural English translation uses an infinitive instead. Choose the Welsh construction from the relationship between the ideas, not from whether the English sentence visibly contains that.

Noun clauses also follow expressions of emotion or evaluation. In Dw i'n falch eich bod chi yma (“I'm glad that you are here”), there is no verb like “say” or “know,” but the clause still gives the content of the feeling. This greatly expands the usefulness of the pattern.

Beyond the Basics: Other Dependent Patterns

At higher levels, bod clauses form part of a larger system rather than serving as a universal equivalent of English that. Future content often uses y bydd, negative content uses na/nad, and formal affirmative reporting after some past verbs may show fod. Reported speech then adds questions, commands, tense relationships, and choices based on register.

You will also meet personal bod forms after conjunctions and prepositions:

• gan fy mod i'n sâl — since/because I am ill
• er ei bod hi'n hwyr — although it is late / although she is late
• heb iddyn nhw wybod — without them knowing

The first two reuse the same personal forms taught here, but their clauses express reason or concession rather than functioning as the object of “think” or “know.” The third uses a different pattern, i + person + verbal noun. Recognising the function of the whole clause prevents you from assuming that every English subordinate clause must use bod.

More formal Welsh may omit reinforcing pronouns where the possessive marker already identifies the person, or choose constructions less common in everyday speech. For active use, consistency matters more than trying to sound literary: fy mod i, dy fod di, ei fod e/fo, ei bod hi, ein bod ni, eich bod chi, and eu bod nhw are a dependable set.

Finally, noun clauses can themselves contain complex material:

Dw i'n credu bod y llyfr brynais i ddoe ar y bwrdd.

This means “I think that the book I bought yesterday is on the table.” The outer frame is Dw i'n credu bod...; inside it, brynais i ddoe describes y llyfr. When a sentence feels long, identify the outer clause first and then unpack one embedded unit at a time.

Practice Tips

1. Build a seven-person drill. Keep the ending simple—yn barod or yma—and cycle through fy mod i, dy fod di, ei fod e, ei bod hi, ein bod ni, eich bod chi, and eu bod nhw. This isolates the mutations before you add harder vocabulary.
2. Join pairs of sentences. Turn Mae'r plant yn cysgu. Dw i'n gwybod hynny into Dw i'n gwybod bod y plant yn cysgu. Then repeat with a pronoun subject and use the personal form.
3. Practise three time frames together. Compare ei bod hi'n gweithio (ongoing, time supplied by context), ei bod hi wedi gorffen (completed), and y bydd hi'n gweithio (future). Saying the full set aloud helps prevent the assumption that bare bod always means present time.

Related Concepts

• Prerequisite: Basic Relative Clauses — compare a clause that describes a noun with one that supplies the content of a thought.
• Next step: Reported Speech — develops tense, questions, and other kinds of reported content.
• Next step: Cause, Purpose, and Result Clauses — contrasts content clauses with clauses explaining why something happens or what it achieves.
• Next step: Concessive and Contrastive Clauses — reuses forms such as er fy mod i and er ei bod hi.
• Later reference: Complex Sentence Structures — combines several dependent clause types in longer Welsh sentences.