That or that?

There are these typical of those sayings. In any case, the teachers were always kicked out by the teachers in the German language.

No one can remember that (my opinion). Much easier is the tactics I use: in most cases when it comes to something, an object, person, otherwise what, then it is. Otherwise usually that. Yeah, that’s my hat. This is <- that has reference to an unknown object. This is my hat. Thus a S.