5. The teacher said that I should study harder that semester.

Câu trần thuật: S1 + V1ed (that) + S2 + V2ed(lùi về quá khứ 1 thì)

this → that

6. She asked me if I had many friends.

Câu gián tiếp dạng câu hỏi yes/no: S1 + V1 + If/Whether + S2 + V2( lùi về quá khứ 1 thì)

7. If we had a lot of money, we would buy a lot of new books.

Câu điều kiện loại 2(không có thật ở hiện tại) If + S + V2(ed), S + would/could/should... + V

8. It is difficult to learn English.

Cấu trúc: It's adj to do sth.

5.The teacher said that I should study harder that semester. - Giải thích: CTT: this ⇒ that

6.She asked me if I had many friends. - Giải thích: CTT: Auxiliary + S + V = If + S + V (lùi lại 1 thì).

7.If we had a lot of money, we would buy a lot of new books. - Giải thích: CĐK loại 2 : If + S + V (QKĐ), S + would + V (nt).

8.It's not easy to learn English.- Giải thích: It's + adj to + Infinitive = V-ing + is + adj.

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