我不敢对我的老板说。
I don't have the guts to say that to my boss. *guts表示“勇气”。
听小道消息说。
A little bird told me. *说不清楚是从哪儿听来的，或者不愿意说出是从谁那儿听来的情况下使用。
A little bird told me that today is your birthday. (听说今天是你的生日。)
Wait. Who told you? (喂!谁告诉你的?)
I heard it through the grapevine. *grapevine 原意为“葡萄藤，葡萄属植物”，这里表示“谣言，传闻”。比较常用。
I just overheard it.
我什么都没说。
I didn't say anything. *表示自己没有泄密的说法。
I kept my mouth shut.
I didn't let the cat out of the bag. *表示“没有泄露秘密”的固定说法。
无意中说漏了嘴。
It was a slip of the tongue.
It was a slip of the tongue. (无意中说漏了嘴。)
Really? Didn't she know about it? (真的吗?难道她不知道?)
I spilled the beans. (我泄露了秘密。)
I stuck my foot in my mouth. (我把不好/失礼的事说出去了。)
我一个字都不说出去。
I won't say a word. *用来表示“保证对谁都不说出去”。
Mum's the word. (我什么都不说。)
I won't say anything. (我什么都不说。)
My lips are sealed. (我的嘴很紧。)
●约定
我保证。
I promise.
You can't tell anyone. (你不能告诉任何人。)
I promise I won't. (知道，我保证。)
我不能保证。
I can't promise. *“不能保证，但可以试试”。表达想帮助对方的心情。
You have to come. (你也来吧!)
I'll try but I can't promise. (我争取去，但不能保证。)
一定。
Will do.
Remember to bring the report. (记住带上你的报告。)
Will do. (一定带来。)
我发誓。
I swear. *语气强烈。
Are you sure? (是真的吗?)
I swear. (我发誓。)
请相信我。
Trust me.
I'm not sure. (我没有把握。)
Trust me. (请相信我。)
Believe me.
I know what I'm doing.
You can trust me.
Trust in me.
说到就得做到。
A promise is a promise!
I'm sorry I can't help you. (对不起，我帮不了你。)
You said you would. A promise is a promise! (你说过你可以，说到就得做到。)
You promised! (你不是答应我了吗!)
You can't go back on your promise now! (你现在不能食言。)