倒装句：so/neither的倒装
eg: He can swim. So can I.
She didn't go to class. Neither did I.
结构：
so/neither+be+ 主语
so/neither+助动词+ 主语
so/neither+情态动词+ 主语
助动词：
一般现在时: do, does/am, is, are
现在进行时: am, is, are
一般过去时: did
现在完成时: have, has
一般将来时: will, shall
过去进行时: was, were
过去完成时: had
过去将来时: would