Vt lại câu 
81. I am sure you didn't lock the front door. Here's the key.
→You can't

82. Is it essential to pick your cousin up at the station?
→ Does your cousin
83. He told me that I was wrong to leave early.
→He criticized
84. People say that there is oil under the North Sea.
→There
85. He speaks more persuasively than his brother.

→ He is a

`81)`

`to` You can't have locked the front door. Here's the key

`-` Can ( not) + have + Ved/ Cột `3`: hành động không thể xảy ra trong quá khứ

`82)` 

`to` Does your cousin have to picked up at the station `?`

`-` Bị động HTĐ: `( ? )` Do/does + S + have to + Ved/ Cột `3` + O `?`

`-` Pick ( sb) up: đón ( ai) đó

`83)` 

`to`  He criticized me for leaving early

`-` criticized ( sb) for + V-ing: chỉ trích ai đó vì đã làm điều gì

`84)` 

`to` There is said to be oil under the North Sea

`-` Dạng câu tường thuật: S + say/said + ( that) + S +V + O 

`85)`  He is a more persuasive speaker than his brother

`-` So sánh hơn: S`1` + tobe + more + adj ( dài) + S`2`

`-` persuasive ( adj): thuyết phục 

`#Ph`