陈述句： 就事物依照其实在情形陈述的句子叫做陈述句.陈述句的句末必须使用句号（Full Stop）“.” 以示句子的陈述结束.
陈述句分为肯定句和否定句（全否定和半否定）
肯定句：基本结构为主 + 谓
例如：It is cold in winter.
He went to London to pass his holiday.
否定句：
1、全否定：用not, no, never, neither, none, nothing等否定.表示“完全不是,完全不”的意思.
例如：He is not a worker.
Nothing is wrong with me.
2、半否定句：在句子里用否定词hardly, scarcely, little, few, seldom, rarely等.
例如：I hardly see anything in the room.
=I can see little in the room.
“all/both/every/each/ 谓语 not”表示概念为“有的是,有的不是”
例如：All of them are not students.
=Some of them are students, some are not.
3、宾语从句的否定形式：用在think, believe, suppose引导的宾语从句里则否定主句.
例如：I don't think he'll come.
=He will not come in fact, I think.