`1,` The last time I went to the supermarket was three weeks ago.

`-` The last time `+` S `+` V-ed/V2 `+` was `+` khoảng thời gian `+` ago.

`=` S `+` have/has `+` not `+`  V-ed/V3 `+` for `+` khoảng thời gian. 

`2,` We have worked on this project for a year.

`-` S `+` have/has `+`  V3/V-ed `+` for + quãng tgian/since + mốc tgian

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

`=` S `+` have/has `+`  been `+` V-ing `+` for + quãng tgian/since + mốc tgian.. 

`3,` He has learnt English since he was in grade 3.

`-` S `+` have/has `+`  V3/V-ed `+` for + quãng tgian/since + mốc tgian

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

`=` S `+` have/has `+`  been `+` V-ing `+` for + quãng tgian/since + mốc tgian.. 

`4,` Tom has learnt the guitar for a month.

`-` S `+` have/has `+`  V3/V-ed `+` for + quãng tgian/since + mốc tgian

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

`=` S `+` have/has `+`  been `+` V-ing `+` for + quãng tgian/since + mốc tgian.. 

`5,` I saw her cross the road.

`-` V (tri giác) `+` O `+` V0 

`6,` The children enjoy going in the rain.

`-` enjoy `+` V-ing: thích làm gì..

`7,` I suggest going out for a meal tonight.

`-` S `+` suggested `+` V-ing.. - đưa ra đề xuất 

`8,` He suggested going out for dinner.

`-` S `+` suggested `+` V-ing.. - đưa ra đề xuất 

`9,` She spent 2 hours driving from London to Edinburgh.

`-` It `+` takes/took `+` O `+` time `+` to V0

`=` S `+` spend(s)/spent `+` time `+` V-ing 

`10,` The new high way will be completed from north to south next year.

`-` Câu bị động của TLĐ: S `+` will `+` be `+` V3/V-ed..(by `+` O) 

`11,` This sweater was being made by my aunt for her son.

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

`12,` My sister's room will be tidied tomorrow.

`-` Câu bị động của TLĐ: S `+` will `+` be `+` V3/V-ed..(by `+` O) 

`13,` The homework was being done by my students.

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