选So I have还是So I do?

题目

选So I have还是So I do?
--You seem to have known all about the accident.
--___________.
我选了So I do,而答案是So I have,为什么?
什么情况用have 什么情况用do?

答案

have是助动词.
这种句型要看原句里有没有助动词,如果有,就用原句里的助动词.
--I will go there tomorrow. (助动词will)
--So will I.
--I have finished my homework.(助动词have)
--So has he.
没有助动词的话,就要用do系列了,当然还要考虑时态.
--I hate milk.
--So do I.
--He didn't go there.
--Neither did she.