Can you end a sentence with the word that?

You can't end a sentence with the word "that" in standard English grammar. It's a relative pronoun, used to introduce a relative clause, and it needs to be followed by a verb and a subject to complete the clause.

For example:

* "This is the book that I was telling you about."

Here, "that" introduces the relative clause "that I was telling you about," which modifies the noun "book."

If you try to end a sentence with "that", it would be grammatically incorrect.