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fast; quick; rapid; swift; speedy; brisk; prompt
early; soon; earlier than usual
premature; too soon; too early
easy; simple; quick; fast
as soon as ...; the moment ...; the instant ...
この電車はとても速いね。
This train is really fast.
速く走れるようになりたい。
I want to be able to run fast.
彼の車は思ったより速かったから驚いた。
His car was faster than I thought, so I was surprised.