Non-defining clauses can be introduced by expressions like all of, many of + relative pronoun:


                                              Person

                                               Thing

                                                                                             all of

                                              + whom

                                              + which

                                                                                             any of

                                              + whom

                                              + which

                                                                                         (a) few of

                                              + whom

                                              + which

                                                                                            both of

                                              + whom

                                              + which

                                                                                            each of

                                              + whom

                                              + which

                                                                                          either of

                                              + whom

                                              + which

                                                                                            half of

                                              + whom

                                              + which

                                                                                            many of

                                              + whom

                                              + which

                                                                                            most of

                                              + whom

                                              + which

                                                                                            much of

                                              + whom

                                              + which

                                                                                            none of

                                              + whom

                                              + which

                                                                                             one of

                                              + whom

                                              + which

                                                                                        two of etc…

                                              + whom

                                              + which

Examples:

a. There were a lot of people at the party, many of whom I had known for years.

b. He was carrying his belongings, many of which were broken.

PRACTICE

Finish the sentences using relative pronouns + OF:

1. We bought an apple pie. We ate half of it.
     We bought an apple pie ………………………………………………………………………..

2. I tried on several jackets. I liked none of them.
     I tried on several jackets ………………………………………………………………………..

 3. We found several magazines. You can see a number of them are about cars.
     We found several magazines ………………………………………………………………………..

4. My neighbor has three daughters. Each of them looks like their mother.
     My neighbor has three daughters ……………………………………………………………………

5. I applied to two schools. I was accepted to neither of them.
     I applied to two schools ………………………………………………………………………..

 6. We attended a lecture on psychology. We understood little of it.
     We attended a lecture on psychology …………………………………………………………………

 7. We rented four videos. None of them was good.
     We rented four videos ………………………………………………………………………..

8. The company laid off employees. Several of them found new jobs quickly.
     The company laid off employees ……………………………………………………………………