(3) doesn't work. (1) and (2) mean the same, but I prefer (2).
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yzh1978Both 1 and 2 mean : You say a lot ,but I only understand a part.If I want to express the meaning: You say a lot ,but I can't understand at all, where should I place the entirely or which other adv I should use? Many thanks!If you are prepared to change other parts, you could say "I enitrely fail to understand you".
yzh1978 How about I entirely don't understand you?It's intelligible, but it doesn't seem the most natural wording.