The phrase "I am afraid to" is followed by a verb. It is an action that you are afraid of. I am afraid to sleep alone.
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Hans51I have learned that 'be afraid to' and 'be afraid of' are different in meaning and usageI do not know why they mean the same just after 'not' is added.
Hans51when can we use 'be certain of doing something' and ' be certain to do something'In most cases they're interchangeable.
Hans51 I have learned that to infinitive implies future happeningsIn my opinion, there are probably as many cases in which the "to infinitive" does not imply future happenings as there are cases in which it does.