一．So引导的倒装句型
So+功能词+主语，该句型必须具备两个条件—a,上句必须为肯定句；b,该主语与上句主语不一致。

注意功能词指be动词，助动词，情态动词。

例如，1.--------Li Lei can dance ------So can Tom.
2-------.I like eating apples. --------So do I.
3,-------He does his homework carefully. --------So do they.
4,------ Li Ming is a good student . ---------So is Mary. 二．Neither/nor 引导的倒装句
Neither/nor+功能词+主语，该句型必须具备两个条件----a上句为否定句；b,该主语与上句主语不一致。

例如，1，--------Li Lei can’t dance.--------Nor can Tom..
2,---------I don’t like eating apples. ---------Neither do I.
3,--------He doesn’t do his homework carefully.---------Nor do they.
4,------Li Ming isn’t a good student.-------Nor is Mary.
三．So引导的强调句型
So+主语+功能词，该句型必须具备两个条件-----a,上句为肯定句；b,该主语与上句主语一致。

例如，1，--------The book is a good book. ----------So it is.
2,----------Tom is a lazy boy. -----------So he is.
四．too 和either
too 用于肯定形式的动词后either 用于否定形式的动词后
I enjoyed the film yesterday. I enjoyed it too
I can’t cook. I can’t, either.。