Modals and perfect modals

Choose the correct option to complete the grammar rule:

"Use should (not) and ought to, to say something is _____________ "

• Necessary

• Prohibited

• a good ( or bad) idea

• Not necessary

Choose the correct option to complete the grammar rule:

" Use have to, has to, and must to say something is ____________"

• a good ( or bad) idea

• necessary

• not necessary

• prohibited

Choose the correct option to complete the grammar rule:

" Use don't have to or doesn't have to to say something is _______________"

• a good (or bad) idea

• necessary

• not necessary

• prohibited

Choose the correct option to complete the grammar rule:

" Use mustn't to say something is dangerous or ___________"

• a good (or bad) idea

• necessary

• not necessary

• prohibited

Choose the correct option to complete the grammar rule:

" Use ________ have if you're sure an explanation is impossible."

• must

• couldn't

• may / might

Choose the correct option to complete the grammar rule:

" Use could have, _______ have, or ________ have if you think an explanation is possible."

• could / couldn't

• must / mustn't

• may / might

Choose the correct option to complete the grammar rule:

" Use _________ have if you're sure an explanation is true."

• couldn't

• must

• might

• may

Rewrite the underlined sentence with couldn't have, could, may, might, or must have:

• Have you asked at the lost and found?

Maybe someone has found it.

Complete the conversation with couldn't have, could have, may have, might have, or must have and the verb in brackets:

PETE: Mom, I heard someone downstairs. Maybe it's a burglar!

MOM: You _______________ (hear) a burglar. There are never any burglaries in this part of town

Choose the meaning of " alibi"

• Evidence that shows something is definitely true

• A line of marks left by somebody or something moving

• An object or fact that helps solve a crime

• Evidence that a crime suspect was somewhere else