在听说教学法中，教师不必解释文法。

In audio-lingualism, there is no explicit grammar instruction.

youdao

无需理由，不必解释，永不后悔！

No excuses, no explanations, no regrets!

youdao

你不必解释了。随便你。

B: you don't have to explain. Suit yourself.

youdao

So, here the city is at a distance. We're in a pastoral space, a beautiful space, and this is all sort of under the guidance of this white cloud, this blinding white cloud. And of course, I don't have to say to you, I'm sure, "Blinding white cloud?

因此，这儿，离城市还有一段距离，我们来到了一个农村，一个漂亮的地方，在那朵白云的引导下,这朵亮白的白云，当然，我不必跟你们解释，我很确定，亮白的白云？

耶鲁公开课 - 1945年后的美国小说课程节选