she isn't fine. Is she fine? Yes,she is. No,she isn't.
It isn't an orange. Is it an orange? Yes,it is.No,it isn't.
改成肯定回答，否定回答，一般疑问句，否定句。
she isn't fine. Is she fine? Yes,she is. No,she isn't.
It isn't an orange. Is it an orange? Yes,it is.No,it isn't.