Monday

Monday is the beginning of the week. It means that we will become very busy with so many things to do. But I really don't like to go on the subway because there are so many people going to work in the morning.

Monday

Monday is the beginning of a week, it means we will become very busy, so many things to do. It's nothing. But I really can't bear to catch the subway, because there are so many people every working day.

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Great job.  Nothing to correct except for adding a space after each comma (,).