JungKim Are these all grammatical and do they mean the same thing? Yes, if the initial time had previously been stated. JungKim In (2) and (4), can you omit "an" without changing its meaning or its grammaticality?
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JungKimAre these all grammatical and do they mean the same thing?Yes, if the initial time had previously been stated.
JungKimIn (2) and (4), can you omit "an" without changing its meaning or its grammaticality?No; it is necessary for the grammar.