=>

3. He asked her if her brother went to work by bus.

-> câu tường thuật dạng Yes/No questions: asked sb if S V(lùi thì, HTĐ -> QKĐ)

4. He has done the housework for two hours.

-> chuyển QKĐ sang HTHT, S have/has V3/ed; for + khoảng thời gian

5. Will an old house be sold by your mother next year?

-> bị động TLĐ: Will S be V3/ed by O?

6. If you don't do exercise, you will put on weight.

-> câu đk loại 1: If S Vs/es, S will V

3. He asked her if her brother go to work by bus?

→ S+ asked/wondered/wanted to know/didn't know/.. + if/whether +S+V( lùi thì )

4.He has been beginning do the housework since two hours

→ Hiện tại tiếp diến: S+have/has+been+ $V_{ing}$

5.Will an old house be sold by your mother next year?

→Bị động : 

S+will/shall+ $V_0$ + O-> S+will/shall+ be + $ V_3$ + by...