1 As luck would have it, he was caught by the teacher again.

不幸的是，他又一次被老师逮个正着。

2 She held the little boy by the right hand.

她抓着小男孩的右手。（这里用“by”与用“with”意思区别很大。）

3 Are you there?

等于句型：Do you follow me?

4 If you think he is a good man, think again.

如果你认为他是好人，那你就大错特错了。

5 If my mother had known of it she'd have died a second time.

要是我妈妈知道了，她会从棺材里爬起来。

6 That took his breath away.

他大惊失色。（很形象的说法啊~）

7 Rubber easily gives way to pressure.

橡胶很容易变形。

8 The elevator girl reads between passengers.

开电梯的姑娘在没有乘客时看书。

between=without，相同用法：

She modeled between roles.

她不演戏时去客串下模特。