Mary often goes home as soon as the class is over. She doesn't want her mother to wait for her.

`=>` Mary often goes home as soon as the class is over in order not to let her mother wait for her.

`=` Mary often goes home as soon as the class is over so as not to let her mother wait for her.

* Cấu trúc: so as not to + Vinf: để mà (phủ định)

                 in order not to + Vinf: để mà (phủ định)

                let + SO + Vinf: cho phép 

`->`Mary often goes home as soon as the class is over in order not to let her mother wait for her. ( Mary thường về nhà ngay khi lớp học kết thúc để không để mẹ phải đợi cô. )

`->`Mary often goes home as soon as the class is over so as not to let her mother wait for her. ( Mary thường về nhà ngay khi lớp học kết thúc để không để mẹ phải đợi. )

`=>`S + V + in oder/so as + ( not ) to + V ( đưa đến mục đích hướng vào đối tượng khác )

`=>`let + O + V-inf: cho phép ai làm gì đó