9 graders: Modal Verbs

MODAL VERBS.

You shouldn't forget about certain things, such as: 

- no "s" in the 3rd person singular

- in the interrogative form we need "Inversion" (May I .....?)

- you do not need an auxiliar verb to write the interrogative or the negative forms
- Modal + verb in the infinitive

- the meaning of the modal verb depends on the context of the sentence.

A. Ability


can/can't/cannot/could (Present/future)

could/couldn't/could not (Past)

She can play the piano.

They can't study alone.


B. Possibility

may/ might/could/ may not/ might not/ could not/ couldn't (Present/future)

might have/ may have / could have (past)

Jane might go to the party.

Jess may win the competition.


C. Permission

can/can´t/ may/ may not 

Teacher, sorry I'm late. May I come in?

Dad, can I go to the party?


D. Certainty/ Obligation

must/ mustn't/ must not (present/ future)

must have (past)

You must obey the school's rules.

Tomorrow you have a Maths test. You must study!

E. Advice

should/ shouldn't (present/ future)

should have (past)

I think you should talk to them.

Should he go to the doctor?


Try this:
http://www.englishpage.com/modals/interactivemodal1.htm