1. At the weekend I usually go swimming (am не нужен, у нас стоит глагол go)
2.Are you enjoying the party (Enjoying - в данный момент - здесь стоит Present Cont)
3 We can't play tennis because It's raining(Не можем поиграть в данный момент)
4 Do you play chess (Модальный глагол can не нужен, т.к стоит вспом гл Do)
5 How many sisters do you have? (Вообще. Можно поставить и have you got)
6 I don't understand what you are saying (вместо no должен стоять don't )
7 What are you doing tonight (Планы на ближайшее будущее - Present Cont)
8 What time did you get home last night? (last night - Past Simple)
9 Last weekend I saw some friends and we had a meal. (last weekend - Past Simple)
10 I love English food. It's wonderful! (Люблю вообще)