名词变成形容词,有一定的规律，一般情况如下：

1．名词后加-y,如： luck→lucky,cloud→cloudy;wind→windy;rain→rainy; sun→sunny,snow→snowynoise-noisyhealth→healthy2．在名词后加-ly,如： friend→friendlylove→lovelyday→daily3．方位名词加-ern，如：east→easternwest→westernsouth→southernnorth→northern