" Is a fine sentence.
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Roach'' I'm flying off to India after 2 years ''why do we have to use '' off ''why can't we just say '' I'm flying to India after 2 years ''"I'm flying to India after 2 years." Is a fine sentence.
RoachWhy do we have to use these '' up ,down,back,over ''?I think it should be clear from the answers you've been given that you don't have to use them.
AlpheccaStarsIn phrasal verbs, the particle changes the meaning, and it is absolutely required.Good point. I foolishly assumed that the OP would not have been talking about phrasal verbs, but only about cases where the adverb was optional.