giải và giải thích vì sao hộ e vs ạ 1Sally hasn’t met Tom since 1999. The last time ___________________________________________________. 2. We haven’t gone to the concert for ages. It’s ___________________________________________________. 3. Sarah hasn’t seen her friends since she left for the United States. Sarah last ___________________________________________________. 4. I have never stayed in such an expensive hotel before. This is ___________________________________________________. 5. Steve started working for this company five years ago. Steve has ___________________________________________________.

`1.` The last time Sally met Tom was in 1999. 

- S + haven't/hasn't + VpII + ... + since + time/for +time

`->` The last time + S + V2/V-ed + ... + was + time + ago/in + time

`2.` It's ages since we last went to the concert. 

- S + haven't/hasn't + VpII + ... + since + time/for + time

`->` It's + time + since + S + last + V2/V-ed + ...

`3.` Sarah last saw her friends when she left for the United States.

- S + haven't/hasn't + VpII + ... + since + time/for + time

`->` S + last + V2/V-ed + ... + when + time/time + ago

`4.` This is the first time I have stayed in such an expensive hotel.

- S + have/has + never + VpII + ... + before

`->` This is + the + first/second/... + time + S + have/has + VpII + ...

`5.` Steve has worked for this company for five years.

- S + started/began + To V/V-ing + ... + time + ago/when + time

`->` S + have/has + VpII + ... + for + time/since + time