I have eaten / I ate
I have not eaten / I didn't eat
I have finished / I finished
I have not finished / I didn't finish
I have answered / I answered
I have not answered / I didn't answer
she played
he chose
we sold
they waited
you (one person, informal) sang
you (one person, informal) didn't sing
you (formal) lost
you (formal) did not lose
I succeeded!