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1·It's + adj. + to do sth. ask sb. about sth. by doing STH. What's your favorite......? The best way to do STH.

做某事的……的。向某人询问某事通过做某事你最喜爱的……是什么？做某事的最好方式。

2·Tell (ask) sb to do STH.

要求(吩咐)某人做某事。

3·D. ask sb. to do sth.

意为“请某人做某事”，固定搭配。