they are busy with their homework on weekdays .with怎么讲.什么时候要用到with,怎么用,

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busy with忙于.

be busy with sth 固定用法，忙于某事。。。

they are busy 的意思是他们很忙
they are busy with ... 是一个固定搭配，意思是忙于什么事。

with 的含义就是中文的 “跟。。。有关”，“和。。。有关”和“于。。。”的意思。常与形容词和不及物动词一起使用构成完整意义。也可以与名词性词语构成介词短语。

你说的“怎么讲”是语音吗？像这个　with=威浮
with 可以说是'和' (I play with my friend .....)

I don't often chat with my parents becouse they are busy(对划线部分 becouse they are busy提问对括号内容提问：She doesn't chat with her friends(because they are all very busy) Some of ____(they) are busy with the orange picking. They are always busy with lessons.同义句 they are a____ busy with their lesson on weekdays 句型转换：they haven't come back because they are too busy.对“they are too busy”提问.--------- --------- they ----------back.一空一词. I seldom chat with my friends now beacuse they are very busy,改为同意句. they are busy with their homework on weekdays .with怎么讲.什么时候要用到with,怎么用, my parents are so busy that they can't s___ any time for me ___you are busy,__you needn't go with meA as ,so B because./ C as ,/ D // they are busy ----------model planes 填词 They are v-- busy(忙） They are busy p______ using computers now 一道英语改病句的题They are always busy with their lessons.不好意思,是改同义句初一英语同义句转换:They are all busy with their homework all the time______ ______ _______are_______ busy_______ their homework the spring festival (),people are all busy with all the things that they need,为什么不填comes 英语翻译They are both busy with their work ____ have to leave their son at home by himself. What are they busy 后用加doing吗?（Wat are they busy doing?)