There's nothing wrong with "all of a sudden." It's just obsolete usage that you are unaccustomed to seeing. "All of the sudden" is incorrect, and arises from people not having heard the expression "all of a sudden" clearly.
There's nothing wrong with "all of a sudden." It's just obsolete usage that you are unaccustomed to seeing. "All of the sudden" is incorrect, and arises from people not having heard the expression "all of a sudden" clearly.
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