It started snowing when you (leave) the school适当形式填空

It started snowing when you (leave) the school适当形式填空 snowing为什么不双写w It's snowing .这里的snowing 是动名词还是进行时?go swimming 要双写W.为什么 It's raining/snowing却不要双写n /w呢为什么go swimming 动名词 而be raining/snowing是进行时呢？ it`s snowing o____ It is snowing now.It______yesterday. Is it snowing right now? It is snowing heavily (介词) It's-snowing.中文意思 It's snowing in Canada and it was snowing outside. it is snowing now.it什么yesterday It is snowing very hard .同义句 It is snowy 还是snowing today ()it often snowing in North China IS it snowing today怎么回答 it is snowing weather 还是snowy weather It's snowing heavily at the airport. 翻译:It's snowing right now .