Giúp nữa ạ cảm ơn 1.His sitter isn't old enough to get married. His sister is.... 2.It't necessary to book tickets for the show in advance. You..................... tickets for the show in advance. 3.There's no point in asking George to help. It isn't................. George to help.

1. His sister is too young to get married.

* S+tobe+too+adj+ (for sb) + to + V

2. We needn't book tickets for the film in advance.

*not necessary to V = needn’t V 

3. It is not worth asking George to help. 

*There’s no point in V_ing = It is not worth V_ing

`@nhaky`

1. His sister is too young to get married.

- giải thích:

+ S + be + too + adj + to V: quá ... để ...

2. You must book tickets for the show in advance.

- giải thích:

+ S + must + V: phải làm gì

3. It isn't worth asking George to help.

- giải thích:

+ It's (not) worth + Ving: (không) đáng làm gì