knowing放在句首怎么用

1、Knowing Ben， we could be waiting a long time.本这个人我们了解，能叫我们等很长时间。

2、Knowing that danger threatened， they were on the alert. 因为知道可能会发生危险，他们处于戒备状态。

3、Half the fun of gardening is never knowing exactly what's going to come up.园艺的最大乐趣是谁也不知道到底会长出什么。