`10` It is Monday since I last took a bath 

`11` She has started her new job for a year

`12` They haven't visted the museum before

`13` She has studied ballet since she was fine

`14` She hasn't met her parents for 3 months

`15` How long is it since you last phoned her?

`16` This is the first time I have climbed this mountain

`17` I have read the book since last night

`-` CT :

It + has been + time + since + S +V2/V-ed

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

This/It is the first time + S + has/have + V-II

S + has/have + V-II

S + has/have + not + V-II

S + began + V-ing

S + started + V-ing

$baoyen.$

`10`. It is Monday since I last took a bath.

`11`. She has started a new job for a year.

`12`. They haven't visited the museum before.

`13`. She has studied ballet since she was five.

`14`. She hasn't met her parents for `3` months.

`15`. How long is it since you last telephoned her?

`16`. This is the first time I have climbed this mountain.

`17`. I have read the book since last night.

`-----------`

`@` Cấu trúc:

`-` This is the first time + S + have/has + V3/ed: Đây là lần đầu ai đó làm gì...

`=` S + has/have + not/never + V3/ed + for/since + khoảng thời gian/mốc thời gian

`-` S + started/began + toV/Ving + time + ago: ai đó bắt đầu làm gì vào thời gian nào trước đây.

`=` S + have/has + V3/ed + for/since + khoảng thời gian/mốc thời gian

`-` The last time + S + V2/ed + was + time + ago: Đây là lần cuối ai đó làm gì..

`=` S + last + V2/ed + time + ago: Ai đó lần cuối cùng làm gì..

`=` S + haven't/hasn't + V3/ed + for/since + khoảng thòi gian/mốc thời gian

`-` When + did + S + V-bare?

`=` How long is it since + S + (last) + V2/ed?