1. Some new machines will be bought by the company next month.

→ BĐ thì TLĐ: S + will + be + V3/ed (+ by O)

→ Trạng từ chỉ thời gian đứng sau "by O"

2. Jenifer asked me what I was going to do the following Sunday.

→ Câu gián tiếp dạng câu hỏi wh: S + asked + O + wh- + S + V (lùi thì)

→ Lùi: TLG (S + is/am/are + going to V) ⇒ S + was/were + going to + V

3. If student practiced speaking English every day, they could improve their English.

→ ĐK loại 2: If + S + V2/ed, S + would/could + V

→ Diễn tả sự việc không thể xảy ra ở hiện tại

1) Some new machines will be bought by the company next month

- Bị động TLĐ: S + will be + PII + (by O) 

- Lưu ý: sau by O sẽ là trạng ngữ chỉ thời gian

2) Jane asked me what was I going to do the following Sunday

- Câu gián tiếp ( Câu hỏi Wh__ )

=> S + asked/told/... + (sb) + what + S + V(lùi thì)

- Lùi đại từ: you -> I

- Lùi thì: TLG -> was/were + going to V

- Lùi trạng từ chỉ thời gian: next Sunday -> the following Sunday

3) If student practiced speaking English every day, they could improve their English

- Câu điều kiện loại 2: If + S + V-ed/V2, S + would/could + V-inf + O