我不知道该说什么好了:I am in doubt what to say. 我不知道该回答什么。I don't know what to reply.我完全不知道该怎样做才好。I was at an utter loss what to do.他讲那么一种方言土语,我根本不懂他说什么。He spoke such a jargon I couldn't make head or tail of what he said.我不知道应该依靠他到什么程度。I don't know how far to rely on him.我不知道他的兴趣是什么，因为我们见面时主要谈工作。I don't know what is his interest, because we talk mainly about work when we meet.我不明白那句话的真意何在。I fail to see the bearing of that remark.我一点也不知道他的计划是什么。What his plans are I am quite ignorant of.有一次这可怜的小东西用一个非常自然和幼稚的问题就把我弄糊涂了，我几乎不知道说些什么（丹尼尔·笛福）。The poor creature puzzled me once . . . by a question merely natural and innocent, that I scarce knew what to say (Daniel Defoe).我不认识这个单词，它的意思是什么？I don't recognize this word - - what does it mean?当谁都不知道说什么时，陷入了尴尬的沉默。There was an awkward silence, when no one knew what to say.一旦真的发生火灾，许多人就不知所措，不知道该干什么好了。:
Many people are at a loss as to what to do in case of a real fire. 我不知道要做什么好。
I am in doubt what to do.
