完整形式如下：
1. Having used these technique,we found a wheel fell off.
2. To get started early, we arrived on time.
3. There was no danger, so the police went back to their office.（或者句首加because，不加so也行）
4. When I caught him cheating I stopped buying things there and started dealing with another shop. （catch sb. doing 抓住某人正在做某事）
5. Your hair needs (being) cut.
1.use(Using)
2.去掉could
3.(so)the police...
4.cheat(cheating)
5.being cut(cutting)
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