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could have met would meet must have met might have been met
would have left must have left might have left should have left
arrived/would catch arrived/would have caught had arrived/had caught had arrived/would have caught
early 20 minutes earlier 20 minutes 20 minutes early 20 minutes earlier
had left left was leaving had been away
How often How far How soon How long
can't mustn't needn't couldn't
fast fastly faster fastest
Miss Missed it Missing it Having missed it
earlier fast faster early