Для выполнения данного задания необходимо использовать времена Past Simple, Present Simple, Past Continuous, Present Continuous в соответствии со смыслом предложения.
- My sister is cleaning the kitchen now.
- I often buy food on Fridays.
- Nick did not go to the Caucasus last year.
- Look out! Who is watching you?
- My grandfather usually works in the garden in the morning.
- I did my homework last Monday.
- Sometimes Maria cooks lunch for herself.
- Sorry! I am late.
- The manager is busy. He is talking with a customer.
- I was in the Crimea last summer.
Ответ: смотри выше.