Https://www.schooltube.com/media/%E3%80%90Scoob%21+2020%E3%80%91+FULL+MOVIE+%E3%80%90HD%7C720p%E3%80%91/0_wg2eq6uw
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He won't go to university unless he works hard
They will wait until he comes back.
She won't go to the park if it rains.
I'll give you the book if I find it.
You will have to take the taxi if you miss the bus.(First Conditional)
Первое и второе предложения используют только в первом типе.
She would not go to the park if it rained
I would give you the book if I found it.
You would have to take the taxi if you missed the bus.( Second Conditional)
She would not have gone to the park if it had rained
I would have given the book if I had found it ( Third Conditional) 

1. I have just seen him crossing the street. (I have just seen him. He was crossing the street.)
2. You have never really worked in your life.
3. When was he passing by? (When did he come?-Это если он прИходил)
4. The director has not returned yet.
5. What have you been gazing at so long?
6. You have been working less recently.
7. Thank you, I have already drunk coffee.
8. She has told me everything.
9. Yesterday when we were going home she told me everything.
10. They have been playing chess since dinner-time.
11. I have been working at this topic since spring.
12. I have heard so much about you.
13. When did he write you last?
14. Where have I seen this face?
15. She has explained everything. She was ill at that time and was not able to ring me up.
16. Have you written a letter to your mother?