Causative verbs show that one person or thing causes another person or thing to do something or to experience a result. In English, the main causative verbs are 'make,' 'have,' and 'get.' The choice of verb can affect the structure that follows and the meaning of the sentence. Causative constructions often focus on who initiates the action and who performs the action.

'Make' is used when a subject forces or strongly causes someone to do something. In this structure, 'make' is followed by an object and a base verb without 'to.' The emphasis is on compulsion or strong influence, not on permission or arrangement. The action is usually performed by the object, not by the subject.

Rule
Use 'make' with object plus base verb to express strong causation.
Do not use 'to' before the verb after 'make' in this structure.

'Have' is used to indicate arrangement, instruction, or permission, often with less force than 'make.' In this structure, 'have' is followed by an object and a base verb without 'to.' 'Have' can also appear with an object and a past participle to show that the subject arranges for a result, typically as a service or completed action. The meaning shifts between causing an action and causing a result, depending on the form that follows.

Rule
Use 'have' with object plus base verb to indicate arrangement or instruction.
Use 'have' with object plus past participle to indicate that the subject arranges for a result.

'Get' is used to express persuasion, encouragement, or successful effort to cause something. The common structure is 'get' plus object plus 'to' plus base verb. 'Get' can also be used with an object and a past participle to mean that the subject manages to cause a result, often similar to arranging for something to be done. This form is frequently used when the causation involves effort or negotiation.

Rule
Use 'get' with object plus 'to' plus base verb to express persuasion or encouragement.
Use 'get' with object plus past participle to indicate causing a result, often by arrangement.

The choice between base verb and past participle depends on whether the meaning is 'causing someone to do something' or 'causing something to be done.' Base verb structures usually focus on the action performed by the object. Past participle structures focus on the result or completion of an action, often as a service or finished task. This distinction helps clarify who is doing the action and what is being emphasized.

Rule
Use the base verb to focus on the object performing an action.
Use the past participle to focus on a result arranged or caused by the subject.

Causative verbs express who causes an action and how the action is carried out or arranged. 'Make,' 'have,' and 'get' differ in typical meaning and in the structures they prefer. Choosing the correct form helps make the sentence clear about causation and agency.