1. my sister and i often (to swim) in the river in summer. 2. i (to swim) with my friends in the river now 3. he (to talk) about the new technologies now 4. paul (to like) (to talk) about his carrier 5. his colleagues (to gossip) constantly about him 6. those who often (to gossip) (not to be) trustworthy. 7. my niece (to play) at the moment though she (not to like) (to play) such noisy games in he evening. 8. the singers (to reverse) .they (to rehearse) in this music hall every day. 9. (not to argue) with me? (not to see) that there (to be) no other way out?! 10. they (no argue) always when i (to see) them! 11. this week my grandparents (to have a rest) in the country 12. tom’s family usually (to have a rest) twice a year 13. why you (to look) at me like that? 14. when you (to look) at her you (to see) that she (to be) the most beautiful girl in the world. 15. as i (to be) in trouble now i (to think) about all possible ways out. 16. i (to think) that it (to be) a good idea (to go) to the seaside this summer

Вот правильные формы глаголов для данных предложений в Present Simple и Present Continuous:

1. My sister and I often swim in the river in summer.
2. I am swimming with my friends in the river now.
3. He is talking about the new technologies now.
4. Paul likes talking (или to talk) about his career.
5. His colleagues are constantly gossiping about him (используется Present Continuous со словом constantly для выражения раздражения).
6. Those who often gossip are not trustworthy.
7. My niece is playing at the moment though she does not like playing (или to play) such noisy games in the evening.
8. The singers are rehearsing. They rehearse in this music hall every day.
9. Aren't you arguing with me? Don't you see that there is no other way out?!
10. They are always arguing when I see them! (Present Continuous с always выражает часто повторяющееся раздражающее действие).
11. This week my grandparents are having a rest in the country.
12. Tom’s family usually has a rest twice a year.
13. Why are you looking at me like that?
14. When you look at her you see that she is the most beautiful girl in the world.
15. As I am in trouble now I am thinking about all possible ways out.
16. I think that it is a good idea to go to the seaside this summer.

Для проверки правил использования времен вы можете обратиться к разделу грамматики на British Council LearnEnglish, а для закрепления материала использовать упражнения на Cambridge English. Чтобы продолжить работу, выберите следующую группу предложений для перевода или укажите конкретное грамматическое правило, которое требует дополнительных разъяснений.