Помогите пожалуйста, дам 50 баллов.

Part 2. Put the verbs in brackets in the Present Perfect form with the preposition since/for.

1. He______ (not do) anything... (since/for) 10 o'clock this morning. [0,5]

2.I______(not see) Tom... (since/for) 3 days. [0,5]

3.Mark ______(be) a singer.... (since/for) ten years. [0,5]​