My parents have just came back home.
My parents has just come back home.
O My parents have just come back home.
Has Mark finded his keys yet?
Has Mark found his keys yet?
Have Mark found his keys yet?
0 - Have they washed their hair? - Yes, they have.
0
- Has they washed their hair? - Yes, they have.
0 - Have they washed their hair? - Yes, they
washed.