Потому что исторически так сложилось, что разныю люди стали говорить и писать на одном языке немножко по-разному.
Helen (is) 17 years old next Sunday.
12. She told me she (will inviting) all her friends to her next birthday party.
13. Are Tom (arrived)? - Not yet.
14. When Sarah came to the party, Paul already (went) home.
15. You (saw) news on television yesterday, didn't you?
16. She didn't tell (anybody) about her plans.
17. Do you read (much)?
18. She paid for her ticket and (leaved).
19. I couldn't open the office door because someone (locked) it.
20. When I phoned her, she (done) her homework
They can sing
He can swim
She can jump
They can jump
He can swim
2 a rro
3 i pro
4 d pro
5 h pro
6 b pro
7 g per
8 e per
9 f per
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