Could you please rephrase that question/topic?
I'm not exactly sure what you mean ...
I'm not exactly sure how to answer that question, but (perhaps) ...
That's a rather difficult question, but (maybe) ...
I'm sorry, but I don't know much about ...
However, it might be possible that ...
Maybe I can answer your question by telling you about a personal experience I had.
That's an interesting question ...
Let me see. Well, I suppose that ...
Well, I think there are 2 (or 3 or more) reasons:
First, ... Second, ... Finally, ...
In my opinion there are three ways of looking at it:
First of all, ... Next, ... Then, ...
Have I given you enough information?
Would you like me to tell you more about ...?
Is that all you'd like to know?
I'm afraid that's about as much as I know.
I think that's about it.
I can't think of anything else right now ...
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