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$1.$ This chair / not / as / comfortable / that one

`=>` This chair is not as comfortable as that one.

Structure: S `+` be (am/is/are) `+` as `+` adj `+` as `+` ........ (So sánh bằng)

$2.$ My father / used / live / a / village / when / he / be / a boy

`=>` My father used to live in a village when he was a boy.

Structure: used to + V : đã từng làm gì

$3.$ It / be / interesting / watch TV / after / dinner

`=>` It is interesting to watch TV after dinner.

Structure: It `+` be `+` adj `+` to V (Cấu trúc chủ ngữ giả)

`1.` This chair is not as comfortable as that one.

Cấu trúc câu so sánh bằng: S1+tobe+as+adj+as+S2

`2.` My father used to live in a village when he was a boy.

used to+Vinf: đã từng làm việc gì đó

`3.` It is interesting to watch TV after dinner.

Dùng chủ ngữ giả "it" để miêu tả sự việc nào đó: It is+adj+to Vinf