`40`. He hasn't read a comic since 2005.
`41`. Ha hasn't played the guitar for ten years.
`42`. We haven't met each other for two weeks.
`43`. It's a month since they last told jokes to the children.
`44`. It's four years since Hoa last took an exam.
`45`. I have never known what a credit card is before.
`46`. The baby has never seen an elephant before.
`47`. This is the first time she has eaten vegetarian food.
`48`. This is the first time the children have enjoyed swimming in a water park.
`49`. Basketball has been played by Tom since he entered university.
`50`. His friends haven't been given his old books since Minh moved to Cu Chi.
`51`. His bike hasn't been ridden by Ba for three months.
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+) This is the first time + S + have/has PII = S + have/has not PII + before/S + have/has never PII + before
+) It's + thời gian + since + S + last Ved/V2 = S + have/has not PII + since/for + thời gian
+) S + began/started + Ving/to V + when/since + thời gian + S + have/has PII + since/for + thời gian
$\text{@su}$
`40`, He hasn't read a comic since 2005.
`41`, Ha hasn't played the guitar for ten years.
`42`, We haven't met each other for two weeks.
`43`, It's a month since they last told jokes to the children.
`44`, It's four years since Hoa last took an exam.
`45`, I have never known what a credit card is before.
`46`, The baby has never seen an elephant before.
`47`, This is the first time she has eaten vegetarian food.
`48`, This is the first time the children have enjoyed swimming in a water park.
`49`, Basketball has been played by Tom since he entered university.
`50`, His friends haven't been given his old books since Minh moved to Cu Chi.
`51`, His bike hasn't been ridden by Ba for three months.
Bonus:
`+` This is the first time + S + have/has PII = S + have/has not P2 + before/S + have/has never PII + before : Đây là lần đầu tiên làm gì
+) It's + thời gian + since + S + last Ved/V2 = S + have/has + not + P2 + since/for + (time)
`+` S + began/started + to V/V-ing + when/since + (time) + S + have/has + P2 + since/for + (time) : bắt đầu làm gì khi...
$\text{#BTS}$
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