Buy
Bought
Bought

See
Saw
Seen

Read
Read
Read

Walk
Walked
Walked

Have
Had
Had

Help
Helped
Helped

Talk
Talked
Talked

Change
Changed
Changed

Go
Went
Gone

Throw
Threw
Thrown

Improve
Improved
Improved

Take
Took
Taken

Sleep
Slept
Slept

Fix
Fixed
Fixed

Send
Sent
Sent

Learn
Learned
Learned

Waste
Wasted
Wasted

Give
Gave
Given

Think
Thought
Thought

Know
Knew
Known

Sell
Sold
Sold

Return
Returned
Returned

Meet
Met
Met

Write
Wrote
Written

Eat
Ate
Eaten

Work
Worked
Worked

Study
Studied
Studied

Rain
Rained
Rained

Travel
Traveled
Traveled