1. That???
Which???
The Which Trials:
That or Which?

2. Nobody likes a dog that bites? OR Nobody likes a dog which bites?

3. If you drop the clause and lose the point of the sentence, use that.
Rules 1
If you drop the clause and lose the point of the sentence, use that.

4. Rules 1
The dog that won best in show was Buster’s bulldog. REMOVE The dog was Buster’s bulldog.

5. A which clause goes inside commas.
Rules 2
A which clause goes inside commas.

6. Buster’s bulldog, which had one white ear, won best in show.
Rules 2
Buster’s bulldog, which had one white ear, won best in show.

7. Commas, which cut out the fat, Go with which, never with that.

8. Practice!!!
The students (that/which) were done played on their phones. My dog, (that/which) is a poodle, can do lots of tricks. The teacher (that/which) gives a lot of homework is a meany. The tree (that/which) lit up was decorated for Christmas. My clock, (that/which) is really annoying, woke me up too early this morning.