Read the sentences. Write should or shouldn´t

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Сравните употребление Present Perfect, Present Continuous и Past Simple
Упр. 210. Раскройте скобки, употребляя гла¬голы в Present Perfect, Present Continuous, Present Simple или Past Simple.
1. Please give me a pencil, I (to lose) mine.

2. I (not to meet) Peter since Monday.

3. Nina just (to finish) work.

4. Where Sergei (to be)? — He (to go) home. He (to leave) the room a minute ago.

5. What you (to read) now? — I (to read) "Jane Eyre" by Charlotte Bronte.

6. They (to read) "Ivanhoe" by Walter Scott a month ago. What about you? You (to read) "Ivanhoe"?

7. My watch (to stop). There (to be) something wrong with it.

8. You (to see) Jack today? — Yes, I (to see) him at the institute.

9. You (to hear) the new symphony by M.? — Yes, I... . — When you (to hear) it? — I (to hear) it last Sunday.

10. You (to change) so much. Anything (to happen)?

11. What you (to do) here at such a late hour? You (to write) your composition? — No, I (to write) it already. I (to work) at my report. — And when you (to write) your composition? — I (to finish) it two days ago.

12. I say, Tom, let's have dinner. — No, thank you, I al-I ready (to have) dinner. 13. What the weather (to be) like? It still (to rain)? — No, it (to stop) raining.