是make a mistake而为什么不是make mistake?a是怎么用的?

是make a mistake而为什么不是make mistake?a是怎么用的? 为什么mistake是可数名词,却用by mistake而不用by a mistake 是take a mistake还是make a mistake 为什么英语中make mistakes要+s呢?而by mistake又不+呢? he did his homework carefully for fear that heHe did his homework carefully for fear that he ( ).A.made a mistake B.makes a mistake C.would make a mistake D.make a mistake为什么选B 不选C? make a mistake造句 make a mistake中译英 短语”犯错误“是“make a mistake还是”make mistakes 短语“犯错误”是“make a mistake还是“make mistakes? 到底是make a mistake on spelling还是make a mistake in spelling I___never make such a mistake again.答案是shall,为什么不是well? I have make another mistake对吗?mistake前面要加a吗?还是就这样?为什么? make a mistake是什么意思啊 make mistake 还是make a mistake 还是两个都可以? Don’t laugh at me when I make a mistake定语是when I make a mistake吗 It's easy to make such a mistake.make前为什么要加to If beautiful is a mistake,i'd rather make mistake Lily took away my English book ____ A.for mistake B.by a mistake C.with mistake D.by mistake为什么不选B?