In meaning, no, but #1 is not so natural a formation. Habits are by nature ongoing, not potential, so the progressive is called for.
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Mister MicawberIn meaning, no, but #1 is not so natural a formation. Habits are by nature ongoing, not potential, so the progressive is called for.Hi, Mr.M: Does the sentence "his habit is to bite his nails whenever he is nervous" sound as natural to you as it does to me?
Hi, Mr.M: Does the sentence "his habit is to bite his nails whenever he is nervous" sound as natural to you as it does to me?
Not really; nor does the gerund. What sounds really natural is 'He bites his nails whenever he's nervous' or, second in order, 'He has a habit of biting his nails whenever he's nervous'.