Do you put a comma behind that word that?

You don't always put a comma after "that." It depends on the function of "that" in the sentence. Here's a breakdown:

1. "That" as a relative pronoun:

* If "that" introduces a restrictive clause (essential to the meaning of the sentence), you don't put a comma after it.

* Example: "The book that I borrowed from the library is very interesting." (The clause "that I borrowed from the library" is essential to identify which book is being discussed.)

* If "that" introduces a non-restrictive clause (provides additional information, but not essential to the meaning), you do put a comma after it.

* Example: "The book, that I borrowed from the library, is very interesting." (The clause "that I borrowed from the library" is not essential to identify the book.)

2. "That" as a conjunction:

* When "that" introduces a dependent clause, you don't put a comma after it.

* Example: "I know that you are tired."

3. "That" as an adjective:

* When "that" is an adjective, you don't put a comma after it.

* Example: "I bought that shirt yesterday."

In summary:

* Comma after "that": Use a comma after "that" when it introduces a non-restrictive clause.

* No comma after "that": Use no comma after "that" when it introduces a restrictive clause, introduces a dependent clause, or is used as an adjective.

Always consider the context of the sentence to determine the correct punctuation.