give information to help define something. For
- I work for a company. >> I work for
a company that sells computer software.
The clause "that sells computer software"
gives extra information about the company.
- She likes people. >> She likes people
who are kind and generous.
The first sentence is too general, wheras the
second sentence gives more information about
who she likes.
give information about people. For example:
- There are many people who want to learn
- A doctor is a person who helps sick people.
Sometimes you can
use that as well as who. For example:
- I like the man that lives next to us.
- I like the man who lives next to us.
This is possible in Essential Relative Clauses,
but not in Non-essential Relative Clauses. For
more information see later units on Relative
give information about things. For example:
- Where's the pencil which was on my desk?
- He's moved to an apartment which has a
That can be
used instead of which especially in informal
speech. For example:
- I'd like a job that has a higher salary.
- I'd like a job which has a higher
salary. - OK
- This is the book that I borrowed from
Lisa. - OK
- This is the book which I borrowed
from Lisa. - OK
As above, which
and that can both be used in Essential
Relative Clauses, but only which can
be in Non-essential Relative Clauses. For more
informaiton see later Units on Relative Clauses.