rain名词' 雨' 或动词' 下雨'
raining现在分词,一般用于进行时
rainy 形容词,一般放在系动词BE 后,或名词前作定语
如
There is lots of rain in summer there .
It often rains in summer there .
It is raining outside.
It is rainy today .
It's a rainy day today .
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