1,whyisMary'sdietnotwork?和whydoesn'tMary'sdietnotwork?有什么区别?2,doyouhavehadalunch?和haveyouhadalunch?有什么区别?英语基础不好,各位莫见怪.非常感谢解答.

Question

1,why is Mary's diet not work?和 why doesn't Mary's diet not work?有什么区别?
2,do you have had a lunch?和have you had a lunch?有什么区别?
英语基础不好,各位莫见怪.非常感谢解答.

Answer 1

1.正确写法：Why is Mary's diet are working?Why doesn't Mary's diet work?两个差异在于时态,一个是强调Mary 还在减肥中（进行式）,一个是简单事实的叙述.
2.Did you have a lunch?和 Have had you a lunch?两种写法,一个是问你过去用过午餐吗?一个是强调你用完午餐吗?没人写成 Do you have had a lunch?一个句子出现两个助动词.