Question

when she had cooked , was not all eaten . they ate some and left some {find the mistake in this sentence plz}‏

Answer 1

"she had cooked"  ...... "she has.."
"was not all eaten" ...... "has not.."‏

Answer 2

actually yes you are right .
"have eaten"
good job‏

Answer 3

I don't think that "ate" will be "eat" cause you talk in the past... maybe "have eaten" ...‏

Answer 4

easy to know there is some mistakes here not only one .
1) capital letter in the beginning of sentences .
2) ate = eat
3) they must to be she, becouse there is only one person in the sentence .
in my opinion
AND HAVE A GOOD DAY‏