john liao What's the difference be between "On Sunday" and "On a Sunay"? On Sunday = it happened this day of the week. On a Sunday = comparing with Monday and the other days of the week.
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john liaoWhat's the difference be between "On Sunday" and "On a Sunay"?On Sunday = it happened this day of the week.
john liaoIt's a good thing I didn't stay at home last Sunday.orIt's a good thing I didn't stay at home on last Sunday?Last Sunday is an adverb of time; putting the preposition on before it is redundant.