精选优质文档-倾情为你奉上初一年级英语知识点之助动词(do, does )的用法只有实意动词作谓语时才涉及使用助动词。以like为例: (1)当句子为肯定句时不涉及使用助动词,只涉及主谓一致原则。 eg : I like English a lot. Michael likes Chinese food very much. (2)当句子为否定句时,要根据主语的人称来决定使用相应的助动词:当主语为三单时,要使用does;当主语为非三单时,用助动词原形do。例如把下列句子变否定句: Kangkang likes math.-Kangkang doesnt like math. They like sports.-They dont like sports. (3)当句子变疑问句时,同样要根据句子的主语来决定在句首使用Do或Does.例如下列句子变问句: Michael likes Chinese Food.-Does Michael like Chinese food? Yes, he do