Grammar Note
表示“下雪”时，句子以 it 作形式主语，如 It snowed heavily.
降雪；飘雪
先理解核心含义，再看它在真实句子里的用法。
降雪；飘雪
(of snow) to fall from the sky; used with the dummy subject 'it'
It snowed heavily last night, so the roads are slippery this morning.
昨晚下了很大的雪，所以今天早上路面很滑。
主语通常用it表示天气，如：It's snowing.（正在下雪。）
(以虚拟主语it引导)下雪
Preceded by the dummy subject it: to have snow (noun etymology 1, noun sense 1) fall from the atmosphere.
使(某物)像雪一样降落
To cause (something) to fall like snow.
用雪或类似雪的东西覆盖或散布(某地或某物)
To cover or scatter (a place or thing) with, or as if with, snow.
使(头发)变白；也指使(某人)头发变白
To cause (hair) to turn white; also, to cause (someone) to have white hair.
snow
Base
原形
snows
3rd person
第三人称单数
snowing
-ing
现在分词
snowed
Past
过去式
snowed
Past participle
过去分词
It snows a lot in winter here.
这里冬天经常下雪。
It snowed heavily last night.
昨晚下了一场大雪。
It has snowed twice this week.
这周已经下了两次雪。
规则动词；常与形式主语 it 连用表示下雪。
It is snowing outside; let's stay inside and drink hot tea.
外面正在下雪，我们待在屋里喝热茶吧。
It snows a lot in this mountain village every winter.
这个山村每年冬天都下很多雪。
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表示“下雪”时，句子以 it 作形式主语，如 It snowed heavily.
该词属于 Oxford 核心词汇，值得优先掌握常见搭配和句型。
Collins 词频等级为 3，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.