Relative clauses (5) –extra information clause (2)

Relative clauses (5) –extra information clause (2)
Relative clauses (5) –extra information clause (2)
You must study this lesson from here  before you study today lesson.
   a)    Prepositions+ whom/which.
In extra information clauses it’s possible to use a preposition before whom (for people) and which (for things).you can say “to whom/which whom/about which/for which” …etc.
  • Mr Hicham, to whom I spoke on the phone last night, is very interested in our plan.
  • Fortunately we had a map, without which we would have got lost.
But in spoken English we often keep the preposition after the verb in the relative clause.
When we do this, we normally use who (not whom).
  • This is Mr Hicham, who I was telling you about.
  • Yesterday we visited the city museum, which I’d never been to before.
   b)    All of/most of etc+ whom/which
Study these examples: 
  • Fouad has been four brothers. All of them are married. (2 sentences).
==>Fouad has three brothers, all of whom are marries. (1 sencence).
  •        Elma has a lot of short stories. She hasn’t read most of them.
==>Elma has a lot of short stories, most of which she hasn’t read. (1 sentence).
You can also say:
None of/many of/much of/ (a) few of/some of/any of/half of/each of/both of/neither of/either of/one of/two of…etc. + whom (people) or which (things).
Look at these examples:
  • He tried on four jackets, none of which fitted him.
  • They’re got three cars, two of which they never use.
  • Adam has a lot of friends, many of whom he was at school with.
  • Three men, neither of whom I had seen before, came into my office.
   c)     Which (not “what”)
You can not use what instead of which in sentences like this:
  • She couldn’t come to the party, which was a pity. (Not “…what was a pity”).
  • The weather was very good, which we hadn’t expected. (Not”…what we hadn’t expected”).
Click here for more about "what".