I don't know what to make of the new manager.

　　這位新經(jīng)理，我不知道怎么評價(jià)他才好。

　　I don't know what you're on about.

　　我不懂你在談什么。

　　I don't know how you can say things like that.

　　真想不到你怎么會(huì )說(shuō)出這種話(huà)來(lái)。

　　I don't know how she puts up with him.

　　我不明白她怎么受得了他。

　　I don't know if I can come but I'll try.

　　我不知道是否能來(lái)，但我盡可能來(lái)。