Hans51 I have learned that adjectives such as afraid, sure, careful, etc function as transitive verbs. You should unlearn this. None of those adjectives can be verbs.
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Hans51I have learned that adjectives such as afraid, sure, careful, etc function as transitive verbs.You should unlearn this. None of those adjectives can be verbs. In your examples, the phrases that follow the adjectives can be viewed as "adjective complements", but not objects.
Hans51how do we interpret "Be careful not to fall down"?Use care to avoid falling down. Try not to fall down. Walk carefully or with caution.
Hans51Thank you so much and then how do we interpret "Be careful not to fall down"?1) Be careful WHAT? Here, not to fall down is the WHAT?That seems more likely to me: