to be - was/were - have been	to have - had - have had	to find out - found out - have found out
to write - wrote - have written	to go - went - have gone	to say - said - have said
to do - did - have done	to catch - caught - have caught	to make - made - have made
to spend - spent - have spent

achter komen, vinden	hebben	zijn
zeggen	gaan	schrijven
maken	vangen	doen
		doorbrengen