cứu tớ câu 37 tới 39B voi

`37,` John started learning French two semesters ago.

`-` S `+` have V3/V-ed hoặc S `+` have been `+` V-ing `+` for + quãng tgian/since + mốc tgian

`=` S `+` started/began `+` V-ing/to V0..

`38,` Polonium and radium were discovered by Marie Curie.

`-` Cấu trúc bị động qkđ: S `+` was/were `+` V-ed/V3… (by + O)

`39,` Mary began living in London six months ago.

`-` S `+` have V3/V-ed hoặc S `+` have been `+` V-ing `+` for + quãng tgian/since + mốc tgian

`=` S `+` started/began `+` V-ing/to V0..

`40,` Jack stopped playing the guitar ten years ago.

`-` DHNB: ago (QKĐ)

(`+`) S + V2/V-ed...

`-` stop + V-ing: dừng hẳn việc gì đó 

`38B, ` Susy began to work at the local supermarket 3 months ago.

`-` S `+` have V3/V-ed hoặc S `+` have been `+` V-ing `+` for + quãng tgian/since + mốc tgian

`=` S `+` started/began `+` V-ing/to V0..

`39B,` It's the first time I have seen such a beautiful coastal village.

`-` S `+` have/has `+` từ phủ định `+` V3/V-ed.. `+` before. 

`->` It’s `+` the first time `+` S `+` have/has `+` V3/V-ed..