`1.` This is the first time I have ever been to Sa Pa.
`->` Cấu trúc :
This is the first time + S + have/ has + V2
`=` S +have/ has + never + V2 + before
`=` This is (It is) the most + Adj/ Adj + est + N + S + have/ has ever + V2
`2.` I haven't seen him since 2010.
`->` Cấu trúc :
The last time + S + V2 was + khoảng thời gian + ago
`=` S + last +V2+ khoảng thời gian + ago
`=` S + have/ has not = haven't/ hasn't + V2 for + khoảng thời gian
`=` It's + khoảng thời gian + since + S + V2
`3.` It's the most amazing sight she has ever seen.
`->` Tương tự cấu trúc câu `1`
`4.` The weather in Sydney isn't as hot as the weather in Rio de Jainero.
`->` So sánh ngang bằng
`5.` They have lived in New York since 2004.
`6.` The last time we went to Ha Noi was three years ago.
`->` Tương tự cấu trúc câu `2`
`7.` Big Ben is the most famous tower in England.
`->` So sánh nhất
`8.` New York is morderner than London.
`->` So sánh hơn
