giải thích ngữ pháp từng câu giupd mình 1. " let's go dancing,..... ?" - " yes , let's " A. will we B. do we C. don't we D. shall we 2................ here , he would help us with these troubles A. Were Peter B. If were Peter C. Unless were Peter D. Unless Peter were

1 D.shall we

Form: Let's+V-inf+(0),will/shall+S?

2 A Were Peter

Cấu trúc câu đảo ngữ

Form: If+S+Past simple, S+Would/Could/Should (not) + V (inf)   (câu điều kiện loại 2)

      =>were+S+ to-inf, S+Would/Could/Should (not) + V (inf)    (V thường)

        Were+ S+(0), S+Would/Could/Should (not) + V (inf)    (tobe)

Example:

• If I were a bird, I would fly.

-> Were I a bird, I would fly. 

• If you knew Japanese, you would understand what I mean.

-> Were you to know Japanese, you would understand what I mean.