Difficult
Be
Was were
Grow
Grew
Sit
Sat
Wake
Woke
Play
Played
Come
Take
Took
sleep
Do
Did
Sing
Sang
Break
Broke
Wear
Wore
Bite
Bit
Give
Gave
Hear
Heard
See
Saw
Feed
Fed
Leave
Left
Fly
Flew
Think
Thought
Pay
Paid
Cry
Cried
Stand
Stood
Write
Wrote