`1,` The last time we cut our hair was last June

-> We have not cut our hair since last June

- S + last + V2/ed + ... + t/gian + ago

= The last time + S + V2/ed + ... + was + t/gian + ago

= S + have/has + not + P2 + ... + for + t/gian

`2,` I wish I had a car

- Câu ước - HT : S + wish(es) + (that) + S + V2/ed ...

`3,` If I were a singer, I could sing that song well

- ĐK loại `2` : If + S + V(qkđ), S + would/could/should + Vbare-inf ...

- Điều kiện trái với hiện tại

`4,` Did you work in this hospital last night ?

- HTHT - NV : Have/has + S + P2 ... ?

- QKĐ - NV : Did + S + Vbare-inf ... ?

`5,` Has your father never driven the car before ?

- This is the first time + S + have/has + P2 ...

= S + have/has + never + P2 + ... + before

`6,` It has rained since this morning

- S + started/began + to V/V-ing ... + t/gian + ago

= S + have/has + P2 + ... + for/since + t/gian