1. regular: play, visit, return, travel, watch, tidy, live, talk
irregular: read, ride, swim, sing, go, eat, write, see
2. read-read
play-played
visit-visited
ride-rode
swim-swam
return-returned
travel-travelled
watch-watched
sing-sang
tidy-tidied
go-went
eat-ate
write-wrote
live-lived
see-saw
talk-talked
3. ate
watched
sang
visited
returned
wrote
saw
4. I didn't walk the dog last night.
Fred and me didn't go fishing last saturday.
She didn't tidy her room yesterday afternoon.
I didn't ride a scooter yesterday.
They didn't read the last Harry Potter book.
