to, too or two

When do we use to, too and too?

Word	Explanation	Example
to	preposition	He walks to school.
		They fly to Budapest.
	before an infinitive	I don't know what to do.
too	also, as well	He sings and plays the drums too.
	sth is more than necessary	This T-shirt is too large.
two	number	We arrived in Rome two hours ago.