用there be句型造句并变为否定,疑问,肯定句,并做肯否定回答.单复数句都要,

单数：肯定句：There is an apple on the desk.否定：There isn`t an apple on the desk.疑问：Is there an apple on the desk?肯定回答：Yes,there is.否定回答：No,there isn`t.复数：肯定句：There are some appl...