`1)` My brother is crazy about football.

`->` S + be + adj + ...

`->` My brother là số ít `=>` is

`->` be crazy about sth: cực thích cái gì

`2)` You had better buy a better dictionary.

`->` had better + V-inf: nên làm gì

`3)` Don't ask foreign tourists about their salary.

`->` ask sb about sth: hỏi ai về cái gì

`->` Don't + V-inf: đừng làm gì

`4)` There are a table and four chairs in the middle of the room.

`->` There + be + N ...

`->` a table and four chairs là số nhiều `=>` are

`5)` I would like to thank you for helping me during my stay there.

`->` would like to V-inf: thích cái gì

`->` thank sb for sth/V-ing: cảm ơn ai về điều gì

`-`

@magnetic