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14. I have never been to the ballet before.
It is the first time I have been to the ballet before
15.John and Mary moved to Edinburgh twenty years ago
It is twenty years since John and Mary last moved to Edinburgh
16.The police started looking for him two months ago
for two months now the police has been looking for him
17.I have never seen a dirtier -looking dog
this is the first time I have seen a dirtier -looking dog
18.Mary rang hour and hours ago
it is hours since Mary last rang
19.it is ages since Alan visited his parents
Alan hasn't visited his parents for ages
20.she started to learn Enghlish 8 years ago
It is 8 years since she last started to learn Enghlish
21.I have never seen such a beutiful building
It is the most beutiful building I have ever seen
Hãy giúp mọi người biết câu trả lời này thế nào?

`14`. It is the first time I have been to the ballet before
`→` It is the first time + (that) + S + have/has + Verb (PP)
`15`. It is twenty years since John and Mary last moved to Edinburgh
`→` it is... since S + V (Động từ V ở thì quá khứ đơn)
`16`. For two months now the police have been looking for him
`→` Hai tháng nay, cảnh sát đã tìm kiếm anh ta
`17`. This is the first time I have seen a dirtier-looking dog
`→` This is the first time + S + have/has + P2: Lần đầu làm gì
`→` S +have/has + never + P2 + before
`→` S+ have/has not + P2 + before
`18`. It is hours since Mary last rang
`→` it is... since S + V (Động từ V ở thì quá khứ đơn)
`19`. Alan hasn't visited his parents for ages
`→` S + hasn't/haven't + Ved/V3 + S
`20`. It is 8 years since she last started to learn English
`→` it is... since S + V (Động từ V ở thì quá khứ đơn)
`21`. It is the most beautiful building I have ever seen
`→` Đó là tòa nhà đẹp nhất mà tôi từng thấy
Hãy giúp mọi người biết câu trả lời này thế nào?

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