英語中變成否定句有兩類。

一，祈使句的肯定句變成否定句。直接在動詞原形前面加don't。例如:Go out. ->Don't go out.二，陳述句變成否定句。1.在am/is/are/was/were后＋not。例如:He is old.->He is not old.2.在情態(tài)動詞后＋not。例如:He can swim.->He can not swim.3..在助動詞動詞后＋not。例如:I will go tomorrow.->I will not go tomorrow.4.借助助動詞，在其后＋not。一般現(xiàn)在時態(tài)借助do/does,一般過去時態(tài)借助助動詞did＋not，借助does/did之后動詞還原。動詞是原形的借助do,動詞＋s的，借助does,過去式的，借助did.例如:I know.->I don't know. He knows.->He doesn't know. They knew.->They didn't know.5.其他變化。some -> any ,some 合成詞-> any 合成詞，too 變either， and 變or。