Must & Have To Quiz 2

We use “must” and “have to” to say that it is necessary to do something. Sometimes it doesn’t matter which you use:

• Oh, it’s later than I thought. I must go OR I have to go.

But there is a difference between “must” and “have to” and sometimes this is important: must is personal. We use “must” when we give our personal feelings.

• You must do something = “I” (the speaker) say it is necessary.
• She’s a really nice person. You must meet her. (I say it is necessary.)
• I haven’t phoned Lily for ages. I must phone her tonight.

“Have to” is impersonal. We use it when we are talking about facts, not our personal feelings. You “have to” do something because of a rule or the situation:

• You can’t turn right here. You have to turn left. (It’s against the law to turn right.)
• My eyesight isn’t very good. I have to wear glasses for reading. (I can’t read without them.)
• Lily can’t come out with us this evening. She has to work. (She has an obligation.)
• I have to get up early tomorrow. I’m going away and my train leaves at 7:30. (Because of the train schedule, it is necessary for me to get up early.)

NOTE: If you are not sure which to use, it is usually safer to use “have to”.

You can use “must” to talk about the present or future BUT not the past.

• We must go now.
• We must go tomorrow.
• WRONG: We must go yesterday.

You can use have to in all forms.

EXAMPLES:

• I had to go to the hospital. (past)
• Have you ever had to go to the hospital? (present perfect)
• I might have to go to the hospital. (infinitive after might)

In questions and negative sentences with “have to”, we use the auxuliary verb DO (do/does/did):

• What do I have to do to get a driving license? (not ‘what have I to do?)
• Why did you have to go to the hospital?
• Salma doesn’t have to go to work on Saturdays.

“Mustn’t” and “don’t have to” are completely different:

You mustn’t do something = it is necessary that you do not do it. (so don’t do it!)

• You must keep a secret. You mustn’t tell anyone. (so don’t tell anyone!)
• I promised I would be on time. I mustn’t be late. (so I must be on time!)

You don’t have to do something = you don’t need to do it (but you can if you want).

• You can tell me if you want but you don’t have to tell me = you don’t need to tell me.
• I’m not working tomorrow, so I don’t have to get up early.

You can use “have got to” instead of “have to“. So, you can say:

• I’ve got to work tomorrow, or I have to work tomorrow.

“When has Nina got to go?” or “When does Nina have to go?”

HAVE TO & MUST Quiz 2

Complete the following sentences by inserting either "must" or "have to" where it's necessary!

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