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The farmers are busy harvesting.的语法

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The farmers are busy harvesting.的语法
请问为什么在harvesting没有介词呢?弄不懂本句的语法结构?
The farmers are busy harvesting.的语法
这是考察一个句型：be busy doing sth.,表示忙于做某事
再问： 分词harvesting不是一个名词吗？名词作状语难道可以不用介词吗？
再答： harvest既是名词又是动词，表示收获，收成
再问： 我就不明白harvesting是怎样与表语busy 连接上的？我没有学过这种语法结构。恩，我分析英语句子很喜欢拿语法套。
再答： 这叫做句型，就是说不管Be busy 后面加上什么动词，都要用doing，不算语法的范畴，你就记住就可以了，这些是比较死地用法，以后碰到就套就是了
The farmers are busy harvesting.的语法 the farmers are busy (harvesting).( 对划线部分提问） 同意句转换1:the farmers are busy harvesting=the farmers are busy the farmers are busy ( )《pick》 apples. the farmers busy every are day(?) The farmers are busy harving the crops in the f____ 填入适当的介词 The farmers are all busy getting ready______the next the farmers are busy (cut)rice 正确形式 理由 Fall is golden and the farmers are busy. The farmers are _____ planting crops.A>busy B>bu Farmers are busy growing ____________(庄稼) in the fields Farmers are usually busy getting the crops in.