Đáp án + Lời giải chi tiết:

Rewrite each sentence, beginning as shown so that the meaning stavs the same.

`1.` Mr.Quant doesn't smoke cigarettes any more

`=>` Mr.Quant used to smoke cigarettes

`2.` There is no longer a market in our neighborhood

`=>`There used to be a market in our neighborhood

`3.` She spent 3 hours a day doing the housework last year

`=>` It used 3 hours a day of her  to do the housework last year

`4.`He doesn't take part in outdoor activities anymore

`=>` He used..to take part in outdoor activities

`5.` It is not necessary to wear a tie to work everyday

`=>` You don't have to wear a tie to work everyday

`6.` The river is not clean enough for me to swim

`=> The river is too dirty for me to swim

***Ghi nhớ: `1)` Used to+  V :được sử dụng để nói về một thói quen, hành động, sự kiện hoặc trạng thái đã từng xảy ra trong quá khứ và không còn xảy ra trong hiện tại nữa. 

  `-` S +  used to + V-(nguyên mẫu)

`2)` Don't have to: không cần phải...............`=` Not necessary: không cần thiết

`3)` Cấu trúc:   S + be + too + adj/adv + (for S.O) + to + V...................

`1`.Mr.Quant used to smoke cigarettes

`->` `\text{S + used to + V-inf :}` Đã từng ( `1 - 4` )

`2`.There used to be a market in our neighborhood

`3`.It used to take her `3` hours a day to do the housework last year

`->` It + takes / took + O + time + to do sth : Mất thời gian để làm gì

`4`.He used to take part in outdoor activities

`5`.You don't have to wear a tie to work everyday

`->` S + have / has + to do sth : Bắt buộc phải làm gì

`6`.The river is too dirty for me to swim

`->` Too :

`=>` S + is / am / are / ... + too adj ( for O ) + to do sth

`\text{# TF}`