Choose the right verb form: Present Simple or Past Simple.
1. Dad didn't buy/doesn't buy a new car yesterday.
2. I didn't watch/don't watched TV last night.
3. Did your mum made/make a chocolate cake yesterday?​

Present Simple используется для часто повторяющихся действий в настоящем, когда мы говорим о привычках, например.

Past Simple используется, когда речь идет о действиях, произошедших в вчера, час назад, неделю назад и т.п.).

В этих предложениях есть указание на время в так что используем Past Simple:

1. Dad didn't buy a new car yesterday.

2. I didn't watch TV last night.

3. Did your mum make a chocolate cake yesterday?​

1. Dad didn't buy a new car yesterday.

2. I didn't watch TV last night.

3. Did your mum make a chocolate cake yesterday?​