36. Mary used to go swimming after school last year.

( Cấu trúc used to do st : kể về 1 thói quen trong quá khứ và hiện tại đã không làm nữa )

37. They live near a lake which is heavily polluted.

38. Mai is the youngest (one) in the group.

( So sánh hơn -> so sánh nhất )

39. I asked them where they were going for their holidays.

( Câu trực tiếp -> Câu gián tiếp )

40. The luggage is so heavy that she can't carry it

( Cấu trúc too + adj + for sb to do st -> Cấu trúc so...that )

Chúc bạn học tốt ^^!

36:mary used to swim after school last year(cấu trúc used to+Vnt)
37:They live near a lake which is heavy polluted.
38Mai is the youngest in the group(dùng so sánh hơn nhất)
39.i asked them where they were going for they holidays.
40:they luggage is so heavy that she can't carry it