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改成否定句和一般疑问句.

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/14 18:41:01
改成否定句和一般疑问句.
I have a stomach-ache.You must help your mother at home.
i don ‘t have a stomach ache
do you have a stomach ache
you needn't help your mother at home
do you need to help your mother at home
再问: They have learned English for three years. 改为一般疑问句
再答: have they learned english for three years
再问: 为什么learned不用原型呢?
再答: has或have是助动词 has或have加过去分词是现在完成时的结构~ 这里的learned就是过去分词的形式~