"Be careful not to fall down"


Here is an interesting question. How do we interpret "Be careful not to fall down"?


1) Be careful WHAT? Here, not to fall down is the WHAT?

2) Be careful WHY? Here, not to fall down is the WHY?

I know this question is really strange but I hope you can understand my point.


And the speech part of "not to fall down" is just an adverb modifying "careful" or an adjective complement having an essential reason to be there?


This question is really strange and interesting, I think, so please show me your interest and mercy. Thank you so much as usual.

edited Apr 02 '13 at 09:35 Hans Contributor

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