So have I 的有关用法

   --- I've just been to my first language  class.
   --- Oh really? So have I.
   1）“So have I”表示“我也如此”。表示“某人/ 物也是如此”的肯定句式是：So + be
    / 情态动词/助动词 +主语。表示前面所述的情况也适用于后者。
   You were at Junior High school last year, and so was my sister.
   He can speak French, and so can I. (= I can speak French too.)
   2）表示“某人/物也是如此”的否定句式为“neither/ nor be/ 情态动词/助动词 +主
   语”。
   This film is not interesting, and neither is that one.
   He won't do it, and nor will I.
   3）如果上文描述的是不止一种情况（两种或以上）时，表示前面所述的情况也适用于后
   者时，我们通常使用以下句式：So it is with sb.或It's the same with sb./sth.
   --- He's an honest worker and works hard.
   --- So it is with you.
   Marx made great progress in Russia and soon he could write articles in it. So it was the same
   with Engles.
   4）表示“某人/物的确如此”时，句式为“So + 主语+ be / 情态动词/助动
   词”，表示对上文所述情况的肯定或认可。
   You say he is diligent; so he is.你说他很勤奋，他的确是这样的。
   --- She can speak German.
   --- So she can.