Is it OK to say "I am getting my oil changed ON tomorrow."? ‘On’ is the word I’m questioning because the sentence is fine without. — Cindy, United States
Answer
The adverbs tomorrow and yesterday mean "on the day after today" and "on the day before today" so the preposition "on" is not needed. Still, sometimes people say "on tomorrow" and "on yesterday" in casual speech, and that's fine. "On tomorrow" should not be used in formal writing, but it can still be heard in the speech of some people.
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