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.
