The security guard is still sitting at the monitors.

His eyes start/begin to show/showing signs of tiredness. He blinks a few times to keep them focused.

1) Is it completely irrelevant which one of 'start to show', 'begin to show', 'start showing', and 'begin showing' I use? Or do some of them sound more natural than the others?

2) Is 'tiredness' fine here if he's just naturally tired because it's late? Is 'fatigue' a stronger word than 'tiredness'?

3) Are the bold-face sentences OK and do they make sense?


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