这句英语中为什么要用by

这句英语中为什么要用by 这句英语为什么要加?She deserved to be punished.这句话中to 后面为什么加的是be而不是by Going by bus doesn't cost as much as by plane.句中为什么用much而不是m Bcause she has been laughed at by her classmates句中为什么要跟上at? 求英语句子分析 为什么要用by which? What do you mean by saying that中为什么要用by来做介词 Test Yourself of Unit3 请问,这句英语中of的作用?为什么要用of? 英语中状语和定语They stood by the roadside talking about the plan.这句 英语：求解此句中follow by的用法 Will we be done here by noon?这句话中do为什么要用被动语态? Many students said they learnt by using English.这句话中为什么要用lea 为什么英语中make mistakes要+s呢?而by mistake又不+呢?