Giúp em với anh chị.

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`2` They didn't let us smoke in here

`->` let sb do sth : để ai làm gi

`3` My teacher advised us to buy that book

`->` advised Sb to do sth : khuyên ai làm gi

`4` He began studying English 6 years ago

`->` started/began + V-ing : bắt đầu làm gi

`5` Mastering English is necessary

`->` Động từ đứng đầu câu + V-ing

`6` It took him 2 hours to write the essay

`->` It + take/took + sb + số tg + to V

`7` He is looking forward to hearing from her as soon as possible

`->` tobe + look forward to + V-ing : mong chờ làm gi

`8` Do you mind helping me to put the chairs away?

`->` Do you mind + V-ing?

`9` Please remember to do this home work

`->` Please + V-inf

`10` Please stop asking so many questions

`->` Please + V-inf

`11` Let's stop discussing phrasal verbs

`->` Let's + V-inf

`12` They stopped playing chess a long time ago

`->` stopped + V-ing 

`13` He stopped smoking 3 years ago

`->` stopped + V-ing