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Must went? Must in the past?

ScottsEnglishScottsEnglish Administrator Posts: 1,296 admin ✭✭✭✭✭✭✭
edited November 2018 in Grammar
A student wrote, "Last week I must went to the library to study."

I told her that "went" is the past of "go"; and that modal verbs take the infinitive form.

She replied, "But I want to say I was obligated in the past."

How do we expression past obligation in English?

"Must" can be used for the present or the future. Examples, "Today I must do my homework before class" , or, "Next week I must see the dentist about this tooth which hurts".

But we cannot use must to talk about the past. Instead, we use have to, in its form had to. For example, "Last week I had to go shopping every day."

Look at the following sentences and use must or had to.

1. Yesterday she _________________ finish her report and hand it to her boss.
2. I ___________________ get up early every day in order to catch the bus.
3. They ______________ be careful not to forget to water their plants before leaving.
4. He ______________ pay a fine because he parked illegally.
5. We _________________ plan carefully before leaving for China last year.
6.. It's a national law that everyone _________________ vote in next week's elections.

Click here for the correct answers.

1. Yesterday she had to finish her report and hand it to her boss.
2. I must get up early every day in order to catch the bus.
3. They must be careful not to forget to water their plants before leaving.
4. He had to pay a fine because he parked illegally.
5. We had to  plan carefully before leaving for China last year.
6.. It's a national law that everyone must vote in next week's elections.

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