when it is,I usually go swimming.填rain的形式麻烦帮我讲一下为何要这样填?

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when it is,I usually go swimming.填rain的形式麻烦帮我讲一下为何要这样填?

when it is,I usually go swimming.填rain的形式麻烦帮我讲一下为何要这样填?
when it is,I usually go swimming.填rain的形式
麻烦帮我讲一下为何要这样填?

when it is,I usually go swimming.填rain的形式麻烦帮我讲一下为何要这样填?
虽然考题可能要你填 raining ,但我觉得 填 not raining 比较符合逻辑.
when it is (not raining),I usually go swimming.
不下雨时我通常去游泳.
when it is ...要跟动词+ing 作为现在进行时,
when it is not ...也一样.

rainy 形容词,下雨的
is 是系动词,加形容词构成系表结构,充当谓语,使句子意思完整。

raining

When it is rainy, I usually go swimming.(be+形容词)
或 When it rains, I usually go swimming. (动词的第三人称单数)
下雨天,我常去游泳。
此句表一般状态,所以用一般现在时,不用进行时raining,因为现在进行时表正在进行。