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1、助动词的用法一、定义 助动词是帮助动词的词，帮助动词构成否定句、疑问句的词。一般现在时中常使用的助动词do和does区别：1、does仅用于三单人称2、do用于第一、第二人称的单复数和第三人称的复数。（五种人称）注意：所有人称的种类一共有6种。（第一人称单复、第二人称单复、第三人称单复）具体用法：一、帮助陈述句构成疑问句My sister does her homework every evening.(肯定陈述句)用法一：帮助陈述句构成疑问句用法一：帮助陈述句构成疑问句My sister does her homework every evening.(变成否定)My sister does
2、 not/dont do her homework every evening.We usually have breakfast before going to school.We usually do not/dont have breakfast before going to school.Kitty and Lucy play table tennis after chool.Kitty and Lucy do not/dont play table tennis after chool.(注：划线单词为句子行为动词，红体构成否定句时使用的助动词)肯定句变为否定句的方法：肯定句变为否
3、定句的方法：1、先看句子的谓语动词（即实意动词）决定使用的助动词。2.看句子的主语人称来决定使用do还是does.3.在句子的谓语动词前面加上do not或does not.(简写成dont后doesnt)4.把含有助动词句中的其他动词变为原形。He has lunch at 12 oclock.He does not have lunch at 12 oclock.I like going swimming.I dont like going swimming.用法二：帮助句子构成疑问句用法二：帮助句子构成疑问句My sister does her homework every evenin
4、g.(变成否定)Does my sister do her homework every evening?Yes,she does.No,she doesnt.We usually have breakfast before going to school.Do you usually have breakfast before going to school?Yes,we do.No,we dont.Kitty and Lucy play table tennis after chool.Do Kitty and Lucy play table tennis after chool肯定陈述句变疑问句的方法：1、先看句子的谓语动词（即实意动词）决定使用的助动词。2.看句子的主语人称来决定使用do还是does.3.在句子前面加上do或does;句号变问号。