They had a wonderful time and so did I.他们过得很开心, 我也一样。

I've been to France twice.—So have we.我到法国去过两次。——我们也一样。

If I can lose weight, so can you.如果我能够减肥, 你也能。

I'd like to know what happened to her.—So would I.我想知道她怎么了。——我也是。