1.Their family is very large.(вроде так)
2.We didn`t open the windows yesterday
3.Have вместо has
4.Is не нужен
5.Are вместо Is
6.Did you finish
7.Was вместо were 
8.Didn`t go
9.My
10.Are
У тебя уже половина правильно сделана была.

Исправленные ош с большими буквами 1) IS very large 2) did not open 3) haVE many friendS 4)HER relatives ARE in 5) ARE two room in HIS 6) DID you FINISH 7) English WAS my favorite subject at school 8) They did not go to the south last year 9) my face 10) are