Singular and Plural.

House----- Houses.

Person------ People.

Child-------Children.

I Have a child; I have two children.


Modals verbs.

Can.

I can play the piano.

They can visit us.

She can come tonight.


Could.

I could sing.

I could love you.

They could help me.


Must.

You must wait for me.

I must eat everything.

You must study to pass the exam.


Have to.

Today I have to train.

I have to eat a piece of fruit everyday.

Oh my Good!!! Tomorrow I have to work.


Should.

You should get up.

They should be arriving at any moment.

I should go out tonight with my friends.