英语改错题：下面每句A、B、C、D四个选项中只有一处错误,请指出并改正.
1.Please [give(A)] [this(B)] new pencil-box [for(C)] [them(D).]
2.[These(A)] [are(B)] my shirts.[It's(B)] [mine(D).]
3.[That's(A)] [ a jacket(B).[It's(C)] [brown jacket.(D)]
4.-[Are(A)] everyone [here(B)] [now(C)]?-No,Li Lei [isn't(D)] here.
5.[A man(A)] behind [the tree(B)] [is(C)] my [mother's(D)] brother.