关于英语倒装句、So do I、So I do、So I am、So am I 分别用在什么情况中?

貌似没有 SO I DO 或者 SO I AM 这种倒桩

so sb do/be是某人确实是如些的意思，某人指上文提到过的人物
so do/be sb则指某人也是一样的意思，主语与上文所提人物不同的。
至于具体是用be还是do，就要看上文出现的是什么了，是be就用，是实义动词就用do

1)- Do you like films?
- So I do(,== Yes,I like films,) So do many other people (==MANY OTHER PEOPLE LIKE FILMS TOO.).
2) - Did you see the film
- So I did.So did Tom.
3) - Are you a student?
- So I am.So is my brother.
4) - Have you seen the play?
- So I have.So have my classmates
5) - Will you see the play?
- So I will.So will my friends.
6) -Was Tom at home then?
- So he was.So were his parents.
-----------会了吗?-------