他当着全班的面背诵了他自己的一首诗。

He recited his poem in front of the whole class.

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于是我挑出一件他做的最好的事，然后当着全班的面表扬了他。

I singled out the one thing he did best and praised him for it before the whole class.

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我当着全班的面要求英文老师帮我修改（她私下帮我改了），然后我请朋友帮我给他。

In front of the entire class, I asked my English teacher to proofread it (she did so in private), and then I asked my friend to give it to him.

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