Modal verbs: obligation, prohibition

MUST is used for...

• Obligation

• Prohibition

• No obligation

• Advice

"You don't have to bring your books" is a/an

• Prohibtion

• Obligtation

• No obligation

• A prohibition in the present

"Must" is synonym of "have to"

• Yes

• No

• Sometimes

The negative of "have to" is "don't have to"

• Yes

• No

• It depends on the context

• Sometimes

The negative for of "must" is "mustn't"

• Yes

• No

• Sometimes

• It depends on the context

Choose the right option: We use:

• Must and have to for prohibition

• Must for prohibition and have to for obligation

• Must for obligation and mustn't for prohibition

• Have to for obligation and don't have to for prohibition

I can't go out because I ..... study for the exam.

To travel to France you ........ show your passport

• Have to

• Must

• Don't have to

• Mustn't

Yesterday I ...... study for today's exam

• Must

• Haved to

• Musted

• Had to

You .... use your phone in the school