Causative verbs show that one person causes another person to do something, or causes an action to happen. In English, the main patterns use make, let, have, get, and allow. These verbs do not always describe the action directly. Instead, they place the real action after them and tell us who causes it. The structure usually needs an object, because someone or something receives the cause or the effect. A sentence like She made her brother clean his room has two roles: she causes the action, and her brother does the cleaning. Causative verbs belong with other verb patterns, so a clear understanding of Verbs helps with the forms that follow them.

Make shows force or strong control. The pattern is subject + make + object + base verb. In The coach made the players run again, the players is the object and run stays in the base form. Let shows permission or freedom. The pattern is subject + let + object + base verb. In My parents let me stay out late, stay is the base verb after the object. After make and let, do not use to before the verb. The verb stays bare, just as it appears in the simplest form. These patterns are common in speech and writing, and make is also useful in everyday vocabulary such as Make.

Force and permission with base verbs

Usage	Explanation
Force	Use make when one person forces another person to act.
Permission	Use let when one person allows another person to act.

Have has two main causative meanings. In the first, it means arrange for a service. The pattern is subject + have + object + base verb or past participle, depending on the construction used in the sentence. In everyday service situations, people say I had my hair cut or She had the mechanic check the brakes. In the second meaning, have describes an experience that happens to you, often with something unpleasant or unexpected. In We had our car stolen last year, the car is affected by the event. The focus is not on the person who does the action, but on the person who arranges the service or experiences the result.

Two common meanings of have

Usage	Explanation
Arranged service	Use have when you arrange for someone to do a service for you.
Unwanted experience	Use have when something happens to you and you experience it.

Get also works as a causative verb, but it sounds less direct than have. With services, it often means arranging for someone to do something for you. The pattern is subject + get + object + past participle. In She got her phone fixed, the sentence shows a completed service and uses a past participle after the object. Get can also describe an unwanted result or an event that affects the subject, as in He got his wallet stolen on the train. The meaning depends on the situation, but the grammar keeps the idea of an outside action done to someone or something. For the participle forms used here, Past Participles gives the form system behind fixed, stolen, and similar words.

Get with services and completed actions

Usage	Explanation
Arrange a service	Use get when you arrange for someone to do something for you.
End up with a result	Use get when you end up with something done to you.

Allow is more formal than let and uses a different structure. The pattern is subject + allow + object + to-infinitive. In The teacher allowed the students to leave early, the students is the object and to leave follows it. The to is part of the verb phrase, so it must appear. Allow often sounds more official in rules, notices, workplace instructions, and written reports. It also appears in passive forms such as The students were allowed to leave early, where the focus moves away from the person granting permission and toward the people receiving it.

Formal permission with allow

Usage	Explanation
Formal permission	Use allow when you need a more formal way to say let.
Permission for an object	Use allow with an object and a to infinitive to show who may do the action.

Causative verbs do not all use the same form after the object. Make and let use the base verb: subject + make or let + object + base verb. Allow uses a to-infinitive: subject + allow + object + to-infinitive. Have often uses a past participle when the action is a service or a completed result: subject + have + object + past participle. Get normally uses a past participle in this meaning too: subject + get + object + past participle. The choice depends on the verb, not on the noun or pronoun after it. A sentence with make does not take to, and a sentence with allow does not drop to. The form after the object is part of the verb pattern.

Verb forms after causative objects

Idea
Use a base verb after make and let when the object follows the verb.
Use a to infinitive after allow when it is followed by an object.
Use a past participle after have and get when you mean that something is done for the subject.

Many causative sentences use past participles, so irregular forms appear often. Common early forms include broken, written, taken, done, made, gone, seen, given, sent, and bought. These forms belong to the same verb families as their base verbs, but the endings change in different ways. In She had her window broken, broken comes from break. In He got his letter written, written comes from write. In They had the documents taken, taken comes from take. These participles are especially useful after have and get, and they also connect with the wider system of Past Participles.

fixedbrokenbuiltmendedcleanedcheckedwrittendeliveredtakenwashed

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This is the past participle of clean and it shows that something was made neatThis is the past participle of deliver and it shows that something was brought to a placeThis is the past participle of build and it shows that something was made or constructedThis is the past participle of check and it shows that something was examinedThis is the past participle of break and it shows that something was damagedThis is the past participle of mend and it shows that torn or damaged things were repairedThis is the past participle of wash and it shows that something was made clean with waterThis is the past participle of write and it shows that text was createdThis is the past participle of fix and it shows that something was repairedThis is the past participle of take and it shows that something was removed or carried away

Common irregular past participles in causatives

Word	Definition
broken	This is the past participle of break and it shows that something was damaged.
written	This is the past participle of write and it shows that text was created.
taken	This is the past participle of take and it shows that something was removed or carried away.
built	This is the past participle of build and it shows that something was made or constructed.
fixed	This is the past participle of fix and it shows that something was repaired.
mended	This is the past participle of mend and it shows that torn or damaged things were repaired.
cleaned	This is the past participle of clean and it shows that something was made neat.
checked	This is the past participle of check and it shows that something was examined.
washed	This is the past participle of wash and it shows that something was made clean with water.
delivered	This is the past participle of deliver and it shows that something was brought to a place.

Scramble

The same causative verb can sound different in different situations. Make can mean force, but it can also mean cause a result, as in The rain made the roads slippery. The structure still shows one thing causing another. Let usually means permission, but in stories or dialogue it can also suggest a decision not to stop someone: They let him go. Word order helps show the focus. With make and let, the object comes before the bare verb, so the person who is affected is clear. With have and get, the past participle often makes the result sound finished or complete. In real English, the surrounding words decide whether the sentence is about control, permission, service, or an event that happens to someone.