下面每句A,B,C,E四个选项中只有一处错误,请指出并改正. （ ）1.This(A) is not my(B) bag

下面每句A,B,C,E四个选项中只有一处错误,请指出并改正. （ ）1.This(A) is not my(B) bag. My(C) is on(D) the chair. ( )2.Please give(A) this(B)new pencil-box for(C) then(D) ( )3.These(A) are(B) my shirts. It's(C) mine(D)(D) ( )4.That's(A) a jacket(B). It's(C) brown jacket (D). ( )5.--Are(A) everyone here(B) now(C)? --No,Li Lei isn't(D) here. ( )6.A man(A) behind the tree(B) is(C) my mother's(D) brother.