Помогите пожалуйста!!!
Задание:
Seven sentences contain mistakes. Circle the mistakes and write the corrections. Tick (+) the correct sentences.

1 it snowed last winter.

2 I think people won't stop..........

3 +

4 .......the test hasn't begun yet

5 +

6 I've already written.............

7 my mum started teaching ten years ago.

8 +

9 we 're going to cycle later.

10 she couldn't go to school last Monday.