I don't know when to use that as a connecting word. If you could give an example it would help.

There are five reasons: 1.) As a pronoun: *It* was easy. *That* was easy. 2.) To be more specific: Do you mean *this* test? Do you mean *that* test? 3.) As an adverb: I don't care *very* much. I don't care *that* much. 4.) When being specific: I ate the apple *with* a worm in it. I ate the apple *that had* a worm in it. 5.) As a conjunction: You told me you were happy. You told me *that* you were happy. I hope that this helps. It can be difficult to remember all of the rules, but if you are looking for a teacher then I am happy to help. :-) Eric

what are you talking about?:-)