幫我看看英文文法對不對???

前三句都好好,但係第四句唔係好明你想講咩,如果想講你參加左歌唱比賽既話,就應該係MY most enjoyable time was when I join the singing contest in the school in P1.
如果你想講你贏左個比賽,就應該係MY most enjoyable time was when I won the singing contest in the school in P1.

My happiest time was when I became a school prefect in P4.- good

My saddest time was when our turtle died in P2 or when our turlte was dead in P2.
.
My most exciting time was when I won the badminton competition in P6.

MY most enjoyable time was when I was at the singing contest in the school in P1.

My happiest time was I became a school prefect when I was primary four.
My saddest time was our (?our)/ (You mean the turtle is yours.) I think you should use my turtle was died when I was primary two.
My enjoyable time was I participate in the school singing contest.
when I was primary one.


Hope I can help you!!!

My happiest time was when I became a school prefect in P4.

My saddest time was when our turtle was died in P2.
We usually write "our turtle was dead" but not "our turtle was died"

My exciting time was when I won the badminton competition in P6.
It should be"My most exciting time"

MY enjoyable time was when I sang contest in the school in P1.
It should be "My most enjoyable time" and "in a contest at school"