1.so+be动词(助动词、情态动词……)+另一主语这一主谓倒装结构表示另一主语与前面叙述的某人情况有着相同的肯定概念，其中so代替上句中的某个成分。
① I was at Centre School last year,so was Bob.
② —I like to do some shopping on Sundays.—So do I.
③ If you go to the cinema tomorrow,so shall I.
Neither/Nor+be动词(助动词、情态动词……)+另一主语这一主谓倒装结构表示另一主语与前面叙述的某人情况有着相同的否定概念。
④ She isn’t right,neither/nor are you.
⑤ —I didn’t watch TV last night.
—Neither did I.
