UNIT 4. Grammar Reference

 

UNIT 4. MODAL VERBS: Have to & Should

 

1. HAVE TO / HAS TO (Obligation)

It is a rule. It is necessary.

• I / You / We / They + have to + verb.

• He / She / It + has to + verb.

• Negative: Don't have to / Doesn't have to (It's not necessary).

Examples:

• Library - you have to be quiet.

• Football - you don't have to kick other players.

• School - She doesn't have to wear a uniform.

• Pilot - has to wear a hat.

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2. SHOULD / SHOULDN'T (Advice)

It is a good idea. To help a friend.

• I, you, he, she, it, we, they + should + verb.

• Negative: Shouldn't (It's a bad idea).

Examples:

• You are tired. You should go to bed.

• It's sunny. You should wear a cap.

• You shouldn't eat many candies.

• We should study for the exam.