When a subject does not do a work himself/herself, and takes the help of some other person or force that person to do that work, then we need to form a sentence with the help of a causative verb.
A. Use get according to tense, B. Place object after the causative verb, C. Main verb always in 3rd form:: CV + Object + V 3rd (main verb).
1. I have got the sums solved.
2. She will get the letter written by Ravi.
3. Are you getting your house pained?
1. Use make according to tense, 2. Object is the person who is compelled, 3. Main verb always in first form:: CV + Object + V 1st form (main verb)
1. He made me laugh.
2. She made the children clean the room.
3. Who is making her cry?
4. Please don’t make him tell a lie.
1. Use help according to tense, 2. Object is the person who is helped, 3. Main verb always in first form:: CV + Object + V 1st form (main verb). (In these sentences a person is helped to do a certain things).
1. Help the guests wash their hands.
2. She helped the children do the work.
(Same as get in use and meaning)
1. I have had the sums solved.
2. He will have the letter written by Merry.
3. They had the tiger killed by the hunter.
CV + Object (person) + V 1st form + ing. There is generally a period of time in these sentences.
1. They kept her washing the clothes for 2 hours. (They compelled her to wash the clothes for 2 hours)
2. Did you kept him waiting for one hour?
CV + Object (person) + V 1st form. Instead of a person there are circumstances, things etc. which compel a person to do a certain thing.
1. Fatigue caused him to sleep. (Due to fatigue he slept)
2. Does poverty cause people to commit crime?