1. have a clue

释义：To have a hint about someone or something，to know anything about something（了解，知道）

用法：要表示了解，知道某人或者某事，在短语后用介词about，即：have a clue about something or someone。

e.g. I don't have a clue about where to start looking for Jim.

我不知道从哪里开始找吉姆。

e.g. Why do you think I have a clue about Tom's disappearance?

你为什么认为我知道汤姆失踪的事?

e.g. Maybe your boss just doesn't have a clue about how much you're really doing.

或许你老板不知道你到底做了多少工作。

e.g. A: Do you think Paul suspects that we're having a surprise party for him?

你觉得保罗会不会怀疑我们为他准备了一个惊喜派对?

B: No, he doesn't have a clue!

不，他一点都不知道！

2. have a lock on

释义：To have complete control over someone or something. （对……胜券在握，完全控制……）

用法：介词on后面可以接somebody，即：have a lock on somebody（完全控制某人），也可以接something，即：have a lock on something（对某事胜券在握）。

e.g. Greg may think he has a lock on the promotion, but I'm determined to prove him wrong.

Greg认为他的晋升是胜券在握，但是我决心要证明他的想法是错误的。

e.g. He would sooner see the whole bank go down the drain than get beaten by us. Unless we have a lock on him—and that won't be easy.

他宁愿看到整个银行都垮掉也不愿被我们打败。除非他被我们完全控制住，但是这并不容易。

3. have a prayer

释义：To have any chance at all of doing or achieving something. （有希望，有机会）

e.g. With that giant supermarket opening up across the street, our little grocery store won't have a prayer of staying open.

由于街对面开了一家大型超市，我妈妈这些小杂货店开不下去了。

e.g. You think you can beat me? Ha! You don't have a prayer.

你认为你可以打败我？哈哈，你一点都不可能打败我。