为什么英语中只有“it rains heavily”而没有“it is rains heavily”的说法呢?

为什么英语中只有“it rains heavily”而没有“it is rains heavily”的说法呢? sometimes it rains 为什么填rains而不填rain? but it rains sometimes.句中rains为何是复数? He usually goes to work by bike except when it rains.请翻译中成中文 He goes to work every day ______.A.except for rainy days B.besides it rains C.but that it rains选什么,为什么 It+often+rains++summer为什么填in 英语很简单的菜鸟问题Trees can help hold soil together and soil absorbs water when it rains. =…and soil takes in water when it rains. and soil takes in的”takes”为什么要＋S呢?不是只有在第三人称后才＋吗?可以的话, 新概念英语1第51课的问题it rains sometimes可以把sometimes放到rains前面吗?为什么?为什么有的副词就能放到动词之前 谢谢! He likes to keep all the windows open when it _______(rian).为什么填rains而不是rainy but it rains sometimes 为什么没有系动词but it's rains sometimes 可以么 I don't imagine that he will come here if it rains,____.a.will he b.won't he为什么不选b? 英语单项选择求解析!_________there,the southwest desert contains a remarkable variety of plants．[　　]　 A．Rarelyas it rains 　 B．Sometimes it rains C．It rarely rains 　 D．Although rarely rains 求详细解析.为什么选A不 it rains here in the summer .(often).(often)应该在 rains的前面还是后面?为什么? i will stay at home if it rains this afternoon.这里为什么用rains? we won't go to the mountains if it rains tomorrow为什么要用rains? He says that if it rains tomorrow,he won't go fishing.是不是间接引语?He told me +宾语从句.的话是不是就不是间接引语啦?只有sb said 直接加宾语 It rains cats and dogs.为什么要译成大雨倾盆 It rains cats and dogs 为什么要翻译成大雨倾盆.