按要求改写下面英文句子
例：She is my sister.（改为否定句）→She isn't my sister.
1.He is an English teacher .（改为否定句）
2.Is it a new stamp?（改为肯定句）
3.Are you Miss Green?（否定回答）
4.Is that your coat?（肯定回答）
5.This is a nice picture.（该为否定句