He (not/know) ____ where his keys are.
doesn't know
He (help) ___ me fix my car three times. I should buy him dinner!
has helped
Simple Past: eat
ate
Past Participle - begin
begun
This class is so difficult! I (take) ___ over 20 tests so far!
have taken
Past Participle - fall
fallen
I'm so excited because I (leave) ___ for Europe tomorrow.
am going to leave/am leaving (prior plan)
Simple past - grow
grew
Past Participle - ride
ridden
(finish) ________________ your assignment yet?
Have you finished
My grandma and I (work) _______ in her garden since September. The flowers are starting to bloom.
have been working
Simple Past - shrink
shrank
Past Participle - shoot
shot
My friend (visit) ___ New York twice. I think she wants to move there in the future.
has visited
Joe (sleep) ___________ since 8:00pm. Should we wake him up?
has been sleeping
Simple past - Sweep
swept
Past Participle - wind
wound