Answer:
The correct answers are:
1. Did you watch TV last night?
- Yes, I watched a movie.
2. Did your friends play football yesterday?
-No, they didn't. They played football three days ago.
3. Did your mum bake a cake last weekend?
- Yes she did. It was delicious.
4. Did you phone a friend an hour ago?
- No, I didn't. I was studying an hour ago.
Explanation:
These questions should be asked in the past simple. How do we realize that? Because they all have expressions of past time: yesterday, last weekend, last night, etc.
To formulate the questions in the past we will use the auxiliar DID (which is the past of Do). This estructure is the next one:
Auxiliary Did + person + verb
To answer them, we can do it in two ways:
With: Yes, I did. // No, I didn't.
Or with the main verb of the sentence, for example:
1. Did you watch TV last night?
- Yes, I watched a movie.