you must go out with anyone.
陈述句按其所包含的谓语部分分成三类：谓语是be动词的肯定句、谓语是实义动词的肯定句与谓语是情态动词的肯定句。
谓语是be动词的肯定句转换为否定句
直接在be动词后加not。如：is not，are not，am not，was not，were not。
He is a math teacher. → He is not a math teacher.
They were players of the school team. → They were not players of the school team.
谓语是实义动词的肯定句转换为否定句
在动词前加助动词否定形式don’t/doesn’t/didn’t，动词的第三人称单数形式或过去式都转变为动词原形。
