There are 9 parts of speech or word classes in English language:
– nouns
– pronouns
– determiners
– verbs
– prepositions
– adjectives
– adverbs
– conjunctions
– interjections

We use causative verbs to express that the subject of the sentence does not do a certain action by himself or herself:
– the subject causes another person do something
– the subject causes something to happen

They let the children play in the yard.
– The subject (they) does not play in the yard.
– The subject causes the object (the children) to play in the yard.

I want to have my hair cut.
= I want my hair to be cut.
= I want someone to cut my hair.
– The subject (I) does not cut his or her own hair.
– The subject (I) asks someone else to cut his or her hair.
– The subject (I) causes something to happen (the cutting of the hair).

Causative verbs:
let
make
have
get
allow
cause
convince
enable
force
motivate
permit
require

Notes:
1. A causative verbs is usually followed by another verb.
2. Causative verbs can change form according to the tense of the sentence.
3. The verbs that follow a causative verb does not follow the tense, but in the form of:
a. base form (active)
b. past participle (passive): have, get

Causative Verbs LET

let
= to allow someone to do something

Pattern: let + object + base form

My father lets his children do whatever they like.
My father lets his children to do whatever they like. (wrong)

They let the door swing open.
They let the door swings open. (wrong)
They let the door to swing open. (wrong)

Causative Verbs MAKE

make
= to ask or force someone to do something

Pattern: make+ object + base form

The manager makes her staff work hard.
The manager makes her staff to work hard. (wrong)

The teacher made him apologize for what he had said.
The teacher made him apologizes for what he had said. (wrong)
The teacher made him to apologize for what he had said. (wrong)
The teacher made him apologized for what he had said. (wrong)

Causative Verbs HAVE

have
= to ask someone to do something

Pattern (1):
have + object (person) + base form (active)

I’ll have my assistant call you tomorrow.
I’ll have my assistant calls you tomorrow. (wrong)
I’ll have my assistant to call you tomorrow. (wrong)

He had the technicians modify the electrical outlets.
He had the technicians to modify the electrical outlets. (wrong)
He had the technicians modified the electrical outlets. (wrong)

Pattern (2):
have + object (thing) + past participle (passive)

I had my jacket cleaned yesterday.
I had my jacket cleans yesterday. (wrong)
I had my jacket clean yesterday. (wrong)
I had my jacket to clean yesterday. (wrong)

I will have my computer fixed.
I will have my computer fixes. (wrong)
I will have my computer fix. (wrong)
I will have my computer to fix. (wrong)

Causative Verbs GET

get
= to ask/encourage/convince/persuade someone to do something

Pattern (1):
get + object (person) + to + base form (active)

I’ll get Terry to help you.
I’ll get Terry helps you. (wrong)
I’ll get Terry help you. (wrong)

We couldn’t get him to sign the agreement.
We couldn’t get him signed the agreement. (wrong)
We couldn’t get him sign the agreement. (wrong)

Pattern (2):
get + object (thing) + past participle (passive)

Jane got her room cleaned.
Jane got her room cleans. (wrong)
Jane got her room clean. (wrong)
Jane got her room to clean. (wrong)

She will get her phone repaired tomorrow.
She will get her phone repairs tomorrow (wrong)
She will get her phone repair tomorrow (wrong)
She will get her phone to repair tomorrow (wrong)

Causative Verbs OTHER VERBS

allow + object + to + base form
I don’t allow my kids to watch violent movies.

permit + object + to + base form
Our boss doesn’t permit us to eat lunch at our desks.

cause + object + to + base form
He caused me to drop my suitcase.

convince + object + to + base form
I’ve been trying to convince John to come to the party.

enable + object + to + base form
The loan enabled Jane to buy the house.

force + object + to + base form
I had to force myself to get up this morning.

motivate + object + to + base form
The plan is designed to motivate the staff to work hard.

require + object + to + base form
The company required all employees to work overtime last week.