both and,either or,neither nor,none of的用法及区别

both .and.意为“两者；两个；双方”（谓语动词用复数）Both John and Ann are good at French.either.or...或者.或者.,不是.就是.He is either a doctor or a teacher.注意：连接两个并列主语是,谓语动词与其靠近的...