examing my shopping receipts,it became obvious that I was overcharged.非谓语能这样连形式主语么？

Having checked my shopping receipt,it became obvious that I was overcharged
要examed 之后才会知道给你钱收多了吧

Having examined my shopping receipts, I was sure that I was overcharged.

After examing my shopping receipts,it became obvious that I was overcharged

主状一致的原则.后面要用I做主语.