Which one is natural? Or what would you say?
Time goes faster than you think. and Time goes quicker than you think.
It goes faster than you think. and It goes quicker than you think.
Good job! All are fine. Here are a few additional ways you could say it
Time moves quicker than you might think.
Time marches more rapidly than you realize.
Time vapes in the blink of an eye.
Time unrelentingly advances.
18 ธันวาคม 2014
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Time passes faster than you expect - would be my preference.
17 ธันวาคม 2014
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They're all OK, but I'd suggest adding 'by' e.g. Time goes by faster than you think.
18 ธันวาคม 2014
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Both make perfect sense. In my opinion it would flow better if you replaced "goes" with "moves."