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after-before ahead-behind angry-happy animal-plant ask-answer aunt-uncle back-front bad-good begin-end behind-in front of best-worst better-worse big-small black-white borrow-lend borrow-return both-neither bottom-top boy-girl busy-free buy-sell careful-careless cheap-expensive clever-foolish close-open cloudy-sunny cock-hen cold-hot come-go cool-warm cry-laugh danger-safety daughter-son day-night dead-living death-birth different-same difficult-easy down-up dry-wet early-late empty-full enemy-friend ever-never fair-unfair（不公平） |
