为什么不能用名词It's rain 非得用形容词rainy It's dog 这都可以接名词 为什么同样是名词的rain就不可以?

为什么不能用名词It's rain 非得用形容词rainy It's dog 这都可以接名词 为什么同样是名词的rain就不可以? likely 用法能不能用It's possible to do 象It's posssible to rain Will it rain tomorrowrain为什么不加s it was dark before we got home but ()it bagan to rain heavily为什么不能用what's worse而用to make things worse可以? 英文 Towards evening,_came,which made things ecen worse.选项A.cold rain 选项B.cold ranis选项C.the cold rain 选项D.a cold rain ,为什么选D,rain不是不可数名词吗?不能用a吗? it's getting dark.为什么不能用turning should it rain tomorrow,we would have to cancel the football match.为什么should不能用would来替换呢 It looks like rain.为什么look like 后直接加rain,众说纷纭哪！有没有确定的答案，look like后面能不能用动词原形？ it's fine with me,为什么不能用it's fine for me? It is great fun为什么不加冠词?为什么a heavy rain加冠词?都是不可数名词,为什么一个加一个不加? It's (rain) hard outside.It's raining hard outside.为什么rain要变成raining 名词单复数的问题take your umbrella with you ,lest it should rain.tale your umbrella in case it rains.为什么一个rain加s 一个没的. 为什么it's raining不能用there's raining,貌似意思一样的呀 It' s ____walk.空里是填 a four hours' 但是为什么不能用 a four hour's? -Let's go bike riding next Sunday,shall we?-Good idea ,unless it (rains) 为什么不填（will rain）-Let's go bike riding next Sunday,shall we?-Good idea ,unless it (rains) .为什么不填（will rain） when it rains.为什么rain加s啊 用括号内所给单词的适当形式填空.There's no __ today.But it will be ___tomorrow.(rain)它们应该填什么?我是写rain rainy的答案是rain rain.为什么!第一个空是there be结构，rain是名词。第二个空是系表结构， no sooner had they come back home than it started to rain翻译成汉语!为什么这里的THAN 不能用WHEN?