1. Các đại từ quan hệ có chức năng TÂN NGỮ trong mệnh đề quan hệ xác định đều có thể lược bỏ.
Eg: - Do you know the boy (whom) we met yesterday?
- That’s the house (which) I have bought.
-Tuy nhiên các đại từ quan hệ có chức năng tân ngữ trong mệnh đề quan hệ KHÔNG XÁC ĐỊNH không thể lược bỏ.
Eg: Mr Tom, whom I spoke on the phone to , is very interested in our plan.
2. Chú ý cách dùng của các cấu trúc mở đầu cho mệnh đề quan hệ: all, most, none, neither, any, either, some, (a)few, both, half, each, one, two, several, many, much, + of which/whom
Eg:
- Daisy has three brothers, all of whom are teachers.
- I tried on three pairs of shoes, none of which fitted me.
- He asked me a lot of questions, most of which I couldn’t answer.
- Two boys, neither of whom I had seen before, came into my class.
- They have got two cars, one of which they seldom use.
- There were a lot of people at the meeting, few of whom I had met before.