Causative with *lassen* in German

In Brief

German lassen + infinitive can mean either have something done or let someone do something. The conjugated form of lassen takes the normal verb position, while the other verb stays as a bare infinitive at the end: Ich lasse das Fahrrad reparieren (“I’m having the bicycle repaired”) and Ich lasse ihn fahren (“I let him drive”).

Overview

The verb lassen is extremely common, but it does more than correspond to English “let.” In a causative construction (a structure in which someone causes or arranges an action rather than necessarily performing it), it expresses having something done: Sie lässt die Heizung prüfen. The subject arranges the inspection; another person carries it out. The person who actually performs the action may be named, but often is not.

The same structure can express permission: Sie lässt ihren Sohn ausgehen means “She lets her son go out.” Context tells you whether the subject arranges a service, permits an action, or causes someone to act. English often switches among “have,” “get,” “let,” and “make”; German can use lassen for several of these ideas.

This is a B2 topic because the basic pattern is simple, but pronouns, several meanings, and perfect-tense word order require care. It builds on ordinary present-tense verb placement and the familiar rule that an infinitive often stands at the end of a German clause.

How It Works

The basic sentence frame

The central pattern is:

subject + conjugated lassen + object or other information + infinitive

• Ich lasse meine Uhr reparieren. — I am having my watch repaired.
• Wir lassen die Kinder spielen. — We let the children play.

There is no zu before the infinitive. In a main clause, the finite verb (the verb carrying person and tense) occupies the usual second position, and the infinitive closes the clause.

In a yes/no question or command, lassen moves as expected, but the infinitive remains at the end:

• Lässt du das Paket liefern? — Are you having the parcel delivered?
• Lass mich ausreden! — Let me finish speaking!

Present-tense and imperative forms

Lassen is irregular. Notice the vowel change a → ä in the second- and third-person singular.

Person	Form	Example
ich	lasse	Ich lasse das prüfen.
du	lässt	Du lässt das prüfen.
er/sie/es	lässt	Sie lässt das prüfen.
wir	lassen	Wir lassen das prüfen.
ihr	lasst	Ihr lasst das prüfen.
sie/Sie	lassen	Sie lassen das prüfen.

The common imperative forms are lass! for informal singular, lasst! for informal plural, and lassen Sie! for formal address: Lass mich erklären, Lasst ihn schlafen, Lassen Sie mich bitte vorbei.

Having something done

When a service or task is arranged, the thing affected is normally an accusative object (the person or thing directly affected by the action):

• Ich lasse den Vertrag übersetzen.
• Sie lässt ihre Wohnung renovieren.

The person carrying out the work is often omitted because they are unknown or unimportant. If you name that person, they can also appear as an accusative noun phrase before the thing affected:

• Ich lasse einen Elektriker die Lampe installieren. — I have an electrician install the lamp.

In practice, German often avoids a potentially heavy two-object sentence by using another wording, such as Ich beauftrage einen Elektriker damit, die Lampe zu installieren (“I commission an electrician to install the lamp”).

Sich etwas machen lassen

For services done to your body, clothing, possessions, or for your benefit, German often uses a dative reflexive pronoun (a pronoun meaning roughly “for myself/yourself/etc.”):

• Ich lasse mir die Haare schneiden.
• Sie lässt sich ein Kleid nähen.
• Wir lassen uns die Einkäufe liefern.

The pronoun is dative because the body part or thing is already the accusative object: die Haare, ein Kleid, die Einkäufe. English usually uses a possessive expression instead: “I’m having my hair cut.” German normally says literally “I have the hair cut for me,” not meine Haare in this standard pattern.

Person	Dative reflexive form
ich	mir
du	dir
er/sie/es	sich
wir	uns
ihr	euch
sie/Sie	sich

Letting or allowing someone to act

When lassen means “let” or “allow,” the person permitted to act is in the accusative case:

• Lass mich dir helfen. — Let me help you.
• Der Chef lässt uns früher gehen. — The boss lets us leave earlier.
• Sie lässt ihn das Auto nehmen. — She lets him take the car.

Do not add zu: Sie lässt ihn gehen, not sie lässt ihn zu gehen. Unlike English, German also does not require a separate “to be” in a service construction: Ich lasse das Fenster reparieren is enough.

Negation and meaning

The position of nicht helps show what is being rejected, but context and emphasis matter:

• Ich lasse das Auto nicht reparieren. — I am not having the car repaired.
• Ich lasse nicht ihn fahren, sondern Anna. — I’m not letting him drive, but Anna.

A negative permission sentence can sound like refusal or prevention: Ich lasse ihn nicht gehen may mean “I won’t let him leave.”

Other tenses

In the simple past, use ließ (singular) or ließen (plural):

• Sie ließ die Tür öffnen. — She had the door opened.
• Wir ließen die Kinder länger schlafen. — We let the children sleep longer.

In the perfect, causative lassen uses the replacement infinitive (Ersatzinfinitiv: an infinitive used where a past participle might be expected). The cluster is main infinitive + lassen:

• Ich habe das Auto reparieren lassen. — I had the car repaired.
• Er hat mich warten lassen. — He made/let me wait.

Do not use gelassen in this construction. Gelassen is used when lassen stands alone in a meaning such as “leave”: Ich habe den Schlüssel zu Hause gelassen.

In a standard subordinate clause, the finite auxiliary comes before the two infinitives:

• ..., weil ich das Auto habe reparieren lassen.
• ..., obwohl sie ihn hat warten lassen.

With a modal meaning in the future or conditional, the structure remains transparent:

• Ich werde die Rechnung prüfen lassen. — I will have the invoice checked.
• Ich würde das noch einmal untersuchen lassen. — I would have that examined again.

Examples in Context

German	English	Note
Ich lasse mir die Haare schneiden.	I’m having my hair cut.	Dative mir marks the person benefiting.
Er lässt das Auto reparieren.	He’s having the car repaired.	The mechanic is not named.
Lass mich dir helfen.	Let me help you.	Permission; mich is accusative.
Wir lassen die Dokumente übersetzen.	We’re having the documents translated.	An arranged professional service.
Lässt du dir die Pizza liefern?	Are you having the pizza delivered?	A question with dative dir.
Die Eltern lassen ihre Kinder allein zur Schule gehen.	The parents let their children walk to school alone.	The children perform the action.
Bitte lassen Sie mich ausreden.	Please let me finish speaking.	Formal request with Sie.
Der Lehrer ließ uns den Text noch einmal schreiben.	The teacher made us write the text again.	Depending on context, lassen can approach “make.”
Ich habe meinen Laptop reinigen lassen.	I had my laptop cleaned.	Perfect with the replacement infinitive.
Sie hat sich ein neues Foto machen lassen.	She had a new photo taken of herself.	Reflexive service pattern.
Wir werden die Heizung vor dem Winter überprüfen lassen.	We’ll have the heating checked before winter.	Future arrangement.
Das Problem lässt sich schnell lösen.	The problem can be solved quickly.	Sich lassen expresses possibility.
Lass das Glas bitte stehen.	Please leave the glass where it is.	Here lassen means “leave,” not permission or a service.
Er lässt ständig sein Handy fallen.	He keeps dropping his phone.	Etwas fallen lassen is a lexical combination.

Common Mistakes

Adding zu before the second verb

• Wrong: Ich lasse das Fahrrad zu reparieren.
• Right: Ich lasse das Fahrrad reparieren.
• Why: After causative or permissive lassen, the second verb is a bare infinitive: no zu.

Conjugating both verbs

• Wrong: Sie lässt der Techniker repariert die Waschmaschine.
• Right: Sie lässt den Techniker die Waschmaschine reparieren.
• Why: Only lassen is conjugated. The action verb stays in the infinitive, and the person carrying it out is accusative: den Techniker.

Using a possessive where German prefers a dative pronoun

• Less idiomatic for the intended service pattern: Ich lasse meine Haare schneiden.
• Natural: Ich lasse mir die Haare schneiden.
• Why: With body care and similar personal services, German commonly uses dative mir/dir/sich plus the definite article. The first version is understandable, but it can focus more neutrally on the hair than on the service received by you.

Using gelassen in the perfect causative

• Wrong: Ich habe das Auto reparieren gelassen.
• Right: Ich habe das Auto reparieren lassen.
• Why: A double-infinitive construction uses lassen, not its participle gelassen.

Copying English “get” too literally

• Wrong: Ich bekomme mein Handy repariert when you simply mean that you arranged the repair.
• Right: Ich lasse mein Handy reparieren.
• Why: English “get something repaired” normally maps to etwas reparieren lassen. Bekommen has other uses and is not the general causative equivalent of “get.”

Confusing the actor with the beneficiary

• Wrong for “I let him cut my hair”: Ich lasse mir die Haare schneiden.
• Right: Ich lasse ihn mir die Haare schneiden.
• Why: Mir says who receives the service; ihn identifies who performs it. Usually the actor is omitted in the shorter sentence.

Usage Notes

One structure, several English translations

Do not assign one fixed English verb to lassen. The relationship between the subject and the action determines the translation:

German function	Typical English rendering	Example
arrange a service	have/get something done	Ich lasse die Küche streichen.
give permission	let/allow	Ich lasse sie entscheiden.
cause or compel	make/cause	Das lässt mich zweifeln.
leave something in a state/place	leave	Lass die Tür offen.

The “make” reading is often context-dependent. Der Trainer ließ uns zehn Runden laufen strongly suggests that the trainer required the running, whereas Meine Eltern lassen mich lange schlafen expresses permission.

Politeness

Imperative lass is common and not automatically rude, but tone matters. With strangers or in service situations, Lassen Sie ... is the formal form: Lassen Sie mich bitte wissen, ob der Termin passt. Requests such as Könnten Sie mich bitte ausreden lassen? are softer than a direct imperative.

Avoiding ambiguity

A sentence such as Sie lässt ihren Bruder fahren can mean “She lets her brother drive” or, in a suitable context, “She has her brother drive.” If the distinction matters, add context or choose a more explicit verb: Sie erlaubt ihrem Bruder zu fahren for permission, or Sie bittet ihren Bruder zu fahren if she asks him to drive.

Beyond the Basics / Advanced Use

Sich lassen + infinitive: possibility

The pattern sich lassen + infinitive often means that something can be done. It resembles a passive expression because the focus is on what is possible, not on the person acting:

• Die Datei lässt sich nicht öffnen. — The file cannot be opened.
• Der Fleck lässt sich leicht entfernen. — The stain can be removed easily.
• Das lässt sich schwer erklären. — That is difficult to explain.

Compare Die Datei kann nicht geöffnet werden. Both express possibility, but sich lassen is often compact and idiomatic. Here sich is not a person doing something to themselves; it is part of the construction.

Lassen with an adjective or location

Sometimes the complement is not another action but a resulting state:

• Lass das Fenster offen. — Leave the window open.
• Sie ließ die Unterlagen auf dem Tisch. — She left the documents on the table.
• Lass mich in Ruhe. — Leave me alone.

These are related to the broad idea of not changing or preventing a state, but they are not causative service constructions.

Fixed combinations

Frequent combinations should be learned as units:

• etwas sein lassen — to leave it alone / not do it: Lass es sein.
• jemanden in Ruhe lassen — to leave someone alone
• etwas liegen/stehen lassen — to leave something lying/standing
• etwas fallen lassen — to drop something
• grüßen lassen — to send one’s regards: Anna lässt dich grüßen.

Also notice loslassen (“let go”) and verlassen (“leave”) are separate verbs with their own meanings and grammar.

Word order in long verb clusters

Perfect subordinate clauses with lassen are a useful advanced pattern because the auxiliary does not simply go at the very end: Ich weiß, dass sie die Wohnung hat streichen lassen. In everyday speech, speakers may avoid a heavy cluster by dividing the thought into shorter clauses. For formal writing and exams, learn the standard pattern hat/habe + infinitive + lassen in subordinate clauses.

Practice Tips

1. Sort examples by meaning. Make three columns headed “arrange a service,” “give permission,” and “leave/cause.” Classify new sentences before translating them. This trains you to use context rather than equating lassen only with “let.”
2. Build a service routine. Write five things you have done professionally, first in the present and then in the perfect: Ich lasse mein Fahrrad reparieren → Ich habe mein Fahrrad reparieren lassen. Include one mir/dir/sich example.
3. Practise the sentence bracket aloud. Say the conjugated lassen early, pause, add the details, and finish with the infinitive: Morgen lasse ... ich beim Zahnarzt ... meine Zähne kontrollieren. Then repeat at natural speed with correct main-clause order: Morgen lasse ich beim Zahnarzt meine Zähne kontrollieren.

Related Concepts

• Prerequisite: Regular Verbs (Present) — review finite verb forms and basic German main-clause word order before working with the two-verb pattern.