That is very kind of you

That’s a lot, even by our standards

That’s not funny

That's my knife.

That would be a nice thing to do.

That’s the way the ball bounces/the cookie crumbles

That happened a long time ago.

That's completely wrong.

That’s [for] definite

That is a separate question

That won’t hold for long.

That doesn’t matter

That’s throwing good money after bad

That's a nice example.

That's 2 euros.

That just takes the biscuit

That is all right with me.

That was intended for me.

That is fine with me.

That was aimed at me.

That’s totally over the top!

That's interesting.

That could be

That's how it all started.

That was a long time ago.