let's not/don't let's/let's don't

let's 可以有三种否定形式: let's not, don't let's 和 let's don't:

A. 正式用法用 let's not:

1. Let's not say anything about it. (CGEL) 让我们不谈此事吧。

2. Let's not think about it. I'm tired of thinking about it. (Hemingway) 让我们不要考虑这件事了。我对考虑这件事感到厌烦了。

3. Let's not talk of that matter. (Wilde) 让我们不谈这件事吧。

B. 英国英语的非正式语体用 don't let's: Don't let's say anything about it. (CGEL) 让我们不谈此事吧。

C. 美国英语的非正式语体用 let's don't:

1. Let's don't say anything about it. 让我们别提此事吧。

2. Let's don't forget. 让我们别忘了。

3. Let's don't go now. 现在让我们别走了。