Ai biết làm thì giải giúp e vs ạ

`9.` The last time I went to work was a month ago.

`10.` It is 5 days since I last talked to him.

`11.` The last time I played football was in 2000.

`12.` The last time I went to HCM city was 2 years ago.

`13.` It's the first time I've ever met such a famous person.

`14.` It's the first time she has ever seen that boy here.

`15.` The last time she wrote to us was last year.

`16.` We started working on this programme five years ago.

`17.` Teachers at the school for gifted students have recently discovered that some of their students also have learning disabilities.

`18.` Our instructors began teaching extra classes for students with learning disabilities in 2008.
`19.` We have already created a resource room for talented students with learning disabilities since 2013.

`20.` In January, our school started using the same curriculum for both talented and challenged students. 

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`@` HTHT `<=>` QKĐ :

`+` It's the first time + S + have/has + (ever) + P2

`=` S + have/has + not/never + P2 + before

`+` It's + thời gian + since + S + (last) + Ved

`=` S + hasn't/haven't + P2 + since/for....

`=` The last time + S + Ved + was....

`+` S + have/has + P2 + since/for...

`=` S + started/began + Ving/to V