my lips are sealed守口如瓶

把疯癫抬到最高级别的灾难，一句就解释了母亲为何非要救女儿。

X is the most horrible Y on this earth

郑重表达某种恐惧或信念时用；日常抱怨小事时用太夸张。

Nothing on earth is worse than losing your mind. ／ Madness is the worst fate a person can face.

literary

madness 重音在前，most horrible 连读，句尾下沉。

Losing your memory is the most horrible doom on this earth. 失去记忆是这世上最可怕的劫难。

把逐客令包成一句建议，客气的外壳里全是赶人的力道。

Why don't you ...?

想委婉催人或提建议时用；对上级这样说会显得失礼。

Why don't you show yourselves out? ／ Perhaps you two should head off now.

口语

don't you 连读像 don-cha，let yourselves 略连。

Why don't you take the early train instead? 你们何不坐早班车走呢？

不说「别偷」，只搬出保险公司，警告藏在客气的假设句里。

They'd be upset if ... were missing

想提醒别人别乱动东西时用；对客人直说会撕破脸。

The owners would notice if something went missing. ／ They'd mind if anything turned up short.

中性

They'd be 弱读连读，if anything were 稍快，句尾放轻。

They'd be upset if anything were missing from the list. 清单上要是少了什么，他们会不高兴的。

用双重否定的轻描淡写，把一场大闹说得云淡风轻，反讽拉满。

It was not exactly a ___.

想说某事其实很糟糕、又要维持体面时用；正式汇报里别这么含糊，容易被追问。

It wasn't exactly a fun night. ／ I'd call that evening less than happy.

中性

I guess 轻快，not exactly 连读，a happy evening 放慢、降调。

That was not exactly a warm welcome. 那算不上什么热情的欢迎。