How to know whether to use 'that' in clauses like 'I don't want that you go to Ireland'?

For me, both next sentences are correct :

• I don't want you to go to Ireland.


• I don't want that you go to Ireland.

How do I know whether or not I should use "that" in a sentences like these?

Answer

Some verbs, can be followed by that clauses, some cannot.

• I don't want you to go to Ireland.
  I don't want that you go to Ireland. (want is not used with a that clause.)

There's no easy way to decide if a verb is followed by a that clause or not. Mostly, you'll have to learn them as part of a phrase.