II. Rewrite the following sentences. 1. Keeping the environment clean is very important. - It’s …………………………………………………………………………….. 2. They will show the time machine to the public when they finish it. - The time machine …………………………………………………………………….. 3. He was delighted to receive his aunt’s letter. - He was delighted that ……………………………………………………………….. 4. Old car tires are recycled to make shoes and sandals. - People ……………………………………………………………………………….. 5. I’m very sad that I wasn’t accepted in that group. - I’m very sad not ……………………………………………………………………. 6. It’s three years since I last spoke to her. - I haven’t ……………………………………………………………………………… 7. Tam doesn’t type as fast as she used to. - Tam used …………………………………………………………………………….. 8. “ Please turn down the radio for me”, said my father. - My father asked ……………………………………………………………………… 9. Lan will be fifteen next week. - It is Lan’s …………………………………………………………………………….. 10. How long is it since you used the pen? - When ………………………………………………………………………….?

. Keeping the environment clean is very important. - It’s ON Í VERY IMORTANT 2. They will show the time machine to the public when they finish it. - The time machine A3. He was delighted to receive his aunt’s letter. - He was delighted that IT. 4. Old car tires are recycled to make shoes and sandals. - People THING  sandals.5. I’m very sad that I wasn’t accepted in that group. - I’m very sad not GROP 6. It’s three years since I last spoke to her. - I haven’t TO HERE 7. Tam doesn’t type as fast as she used to. - Tam used USE 8. “ Please turn down the radio for me”, said my father. - My father asked FROM 9. Lan will be fifteen next week. - It is Lan’s  be fifteen next week.10. How long is it since you used the pen? - When 

$1.$ It's very important to keep the environment clean.

- S + to be + adj + (for sb) + to V $=$ Gerund (Danh động từ) + to be + adj: như thế nào khi làm gì.

$2.$ The time machine will be shown to the public when it is finished.

- Thì tương lai đơn + when + Thì hiện tại đơn.

- Câu bị động thì tương lai đơn: S + will + be + V (P_II) + (by O).

- Câu bị động thì hiện tại đơn: S + am/ is/ are + (not) + V (P_II) + (by O).

$3.$ He was delighted that he received his aunt’s letter.

- S + to be + adj + that + S + V ...

$4.$ People recycle old car tires to make shoes and sandals.

- Thì hiện tại đơn với động từ thường: $S$ $+$ $V$ $(s/es).$

   + I, You, We, They, Danh từ số nhiều: giữ nguyên động từ.

   + He, She, It, Danh từ số ít: Thêm "s" hoặc "es" sau động từ.

$5.$ I’m very sad not to be accepted in that group.

- S + to be + adj + (not) + to V.

$6.$ I haven't spoken to her for three years.

$-$ It is + time + since + S + last + V (-ed/ bất quy tắc) $⇔$ S + haven't/ hasn't + V (Pii) + since + time.

$-$ "Đã bao lâu kể từ lần cuối làm gì đó $⇔$ Đã không làm gì được một thời gian".

$7.$ Tam used to type fast.

- used to $+$ $V$ $(Bare)$: Dùng để diễn tả hành động đã xảy ra và kết thúc trong quá khứ, không còn xảy ra ở hiện tại. Nói cách khác là trong quá khứ mình đã từng làm hành động này nhưng bây giờ thì không làm nữa.

$8.$ My father asked me to turn down the radio for him.

- Câu tường thuật yêu cầu/ mệnh lệnh: $S$ $+$ $told$$/$ $asked$ $+$ $O$ $+$ $(not)$ $+$ to- infinitive.

- Thay đổi từ: me $→$ him.

$9.$ It is Lan's fifteenth birthday next week.

- Thì hiện tại đơn với động từ to be: S + am (I) $/$ is (He, She, It, Danh từ số ít) $/$ are (You, We, They, Danh từ số nhiều) + $...$

$10.$ When did you use the pen?

- When + did + S + V (Bare) = How long + have/ has + S + V3?