Relative cleuses "that" or "about which"

[Jonifa]

Relative clauses - "that" or "about which"
In the sentence

"It''s a subject ___________ I know a great deal"

Which one is correct:

"that" ot "about which" ?

and Why ?

Again thanks in advance

[Alan]

Hi,

You can't use 'that' with a preposition - before it. It is also possible to say: It's a subject that I know a great deal about.

Alan
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[Edison_Chen_e_c]

<which, who, that = conj+pron>

1.I love the girl who is standing there.
= I love the girl and she is standing there.
(You can tear who into a conj and a pron)

2.I love the boy who/whom you're talking to.
= I love the boy to whom you're talking. (after a prep it's better not use 'who')
= I love the boy that you're talking to.
= I love the boy and you're talking to him.
(the pron from who can be the subject and the object)

As for your sentence:

=It's a subject and I know a great deal about it/the subject.
=It's a subject that I know a great deal about.
=It's a subject which I know a great deal about.
=It's a subject about which I know a great deal.

not

It's a subject about that I know a great deal.
or
It's a subject that I know a great deal.
(As the clause needs a prep 'about')

[Torsten]

Hi,

You might want to read this material Alan has written about the relative pronouns.
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