Giúp mình vớiiiiiiii....

`1.` I haven't written a letter for `5` years.

`2.` When was the house built?

`->` Bị động thì QKĐ:
$\text{(?) Was/were + S + P2 + (by O)?}$

`3.` I haven't met him for 3` days.

`4.` She has been working as an accountant for `2` months.

`5.` He has played football since he was `6` years old.

`6.` The last time I went to Ho Chi Minh city was `2` years ago.

`7.` I have never seen such a beautiful girl before.

`8.` This is the first time I have seen such a beautiful girl.

`9.` This is the first time I have eaten such a delicious cake like this.

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$\text{This is the first time + S + have/has + P2}$

`=` $\text{S + have/has + never + P2 + before}$

`=` $\text{S + have/has not + P2 + before}$

$\text{The last time + S + Ved/V2 + was + time + ago}$

`=` $\text{S + have/has not + P2 + for + time}$

`=` $\text{S + last + Ved/V2 + time + ago}$

`=` $\text{It has been + time + since + S + last + Ved/V2}$

$\text{S + started/begin + to V/V-ing = S + have/has + P2 | S + have/has been + V-ing }$

$chucbanhoctot$
$\boxed{\color{purple}{\text{#KaitoKid!}}}$