1名词后加-y, 如 luck→lucky, cloud→cloudy; wind→windy; rain→rainy; sun→sunny, snow→snowy noise-noisy health→healthy
2名词后加-ly, 如friend→friendly love→lovely day→daily
3名词后加-ern,如 east→eastern west→western south→southern north→northern
4通过加某些后缀ing,如earning ,
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