That is. / That has. / That was. / That does.

(nonstandard, dialect, e.g. Black Country, Northern Ireland) whose, of which, in dialects that require a human antecedent for 'whose'

that's a relief (said upon hearing good news that makes someone cease to be worried about something)

That is the way things happen.

(idiomatic) Said of something that has an even greater impact or effect than what is readily apparent, considering the context.

Indicates approval at someone who is doing something praiseworthy.

(informal) That is unlikely to be true.

Alternative form of be that as it may, be it as it may

That is the end; there is no more; that's it; that's all

(colloquial) Used to indicate that one aspect of an otherwise bad situation is good. / (colloquial) Used to indicate approval, surprise, &c.