A:

1)was reading - was listening

+)While+ S+ was/were+V_ing, S + was/were+V_ing: 2 hành động cùng diễn ra trong quá khứ

2)are sleeping

+)Keep silent!(câu mệnh lệnh) => Hiện tại tiếp diễn: S+ is/am/are+ V_ing

3)to read - ∅

+)used to + V: thường làm gì trong quá khứ

B:

1) Tom has never played badminton before

2) Laura asked Eric if he could help her with the homework

3) Pam and Joseph wish they were on holiday in Brazil instead of staying at home

1. was reading/ was listening

While+ S+ was/were+Ving, S+ was/were+Ving: diễn tả 2 hđ diễn ra song song trong quá khứ

2. are sleeping

Keep silent!=> HTTD: S+ is/am/are+ Ving

3. to read/ was

used to+ V: thường làm gì trong qk

B.

1. Tom has never played badminton before

This is the first time+ S+ have/has+ Pii

= S+ has/have never+ Pii before

2. Laura asked Eric to help her with the homework

ask sb toV: yêu caaif ai đó làm gì

3. Pam and Joseph wish they could have holiday in Brazil instead of staying at home

S + wish(es) + (that) + S + V-ed