Đáp án:

`27.`  The house is spacious enough to accommodate them all.

`-` Cấu trúc `:` S + be + adj + enough + to do sth + O.

`-` HTĐ ( Động từ tobe `-` CKĐ ) `:` S + is / am / are + O.

`28.`  You can't visit the United States unless you get a visa.

`-` Unless `=` If not

`-` Cấu trúc `:` Unless + S + V (s / es) + O ; S + can / shall / will (not) + V.

`-` Sau unless là một mệnh đề khẳng định

`29.`  My friend suggested sharing the cost of the tour.

`-` Suggest + Ving `:` Gợi ý ; đề nghị làm gì đó

`-` QKĐ ( CKĐ ) `:` S + V2 / Ved + O.

`30.`  It is necessary for you to book tickets for the show in advance.

`-` It's / is + necessary + (for sb) + to do sth + O.

`=` S + need + to do sth + O.

=>

27. The house is spacious enough to accommodate them all.

-> be adj enough to V: đủ...để

28. You can't visit the United States unless you get a visa.

-> unless ~ if not

29. My friend suggested sharing the cost of the tour.

-> suggest Ving: đề nghị, gợi ý

30. It is necessary for you to book tickets for the show in advance.

-> it is necessary (for sb) to V ~ need to V