Read these sentences and choose must or had to. 1. Last week she was busy. She work a lot.

had to
must

2. The train was full of people. I stand.

had to
must

Answer 1. had to

Answer 2. had to

Объяснение:

Remember!

We use must when we talk about necessity and rules. It is used in present.

Had to is used in past. We use it when someone is obliged to. We use it when we can’t use must.

1. Must can be replaced by have to with little difference in meaning:

2. Have to is a more informal while Must is mostly used in written orders or instructions.

3. When we are mentioning someone else's obligations, we use have to.

4. For questions it is more common to use have to instead of Must (which sounds very formal).

5. The past tense of Must is Had to:

Mustn't  and Don't have to

Mustn't is a negative obligation (= it is important that you do NOT do something) while don't have to is an absence of obligation.

Mustn't = it is prohibited; it is not allowed

Don't have to = no obligation; you are not required to do something, especially if you don't want to.

Объяснение:

1. Last week she was busy. She must work a lot

2. The train was full of people. I had to stand