Using which and that in adjective clause

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Now, let's look at which in Adjective Clauses. Well, that means we're going to talk about things, not people. Which refers to things.

The boy which found my wallet...?

No. You can't use which with people.

But look this:

The wallet    OXXSXXV
The wallet which he found was full of money.

Or you can say:

The wallet   OXSXXV
The wallet that he found was full of money.

There's no difference between which and that in those sentences.

And,you can omit the object pronoun:

The wallet OXSXXV
The wallet ø he found was full of money.

That's pretty neat! Okay. Now let's look at using which and that as subject pronouns. Here are the two sentences we want to combine:

The bus goes downtown. It stops at this corner.

The bus whi SXXV
The bus which stops at this corner goes downtown.
The bus wSXXV
The bus that stops at this corner goes downtown.

Which or That, it doesn't matter (though native speakers seem to prefer that here). But you have to use one of them. You CAN'T omit a subject pronoun from an Adjective Clause.

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