so

v. Be 动词、助动词、情态动词

so + v. + 主语

句式

so + v. + 主语

与前面所叙述情况相同，前后只有主语不一致时。

My fater has been to the USA before.So has my mother.
我妈也去过

so + 主语 + v.

句式

so + 主语 + v.

“的确如此”

She used to be a teacher.
So she did.