he is very busy(writing)his papers.he is far too busy（to receive）callers

be busy doing sth忙于做某事
be busy with sth忙于某事
too+adj/adv to do sth 太（怎么样）而无法做某事
He is far too busy（to receive）callers.
他太忙了,而无法接电话.tony,would you go and see if Sam has any difficulty()his tape recorder？为什么括号里填fixing，不是have sth done吗？have difficulty in doing sth in可省略，意思为：在做某事方面有麻烦为什么可以这么搭配啊have n in doing sth都可以认为是做某事怎么样吗？find adj to do跟这个用法一样？？？、不太懂你的意思。但是有好几个短语都有类似的用法，如：have problems doing sthhave trouble doing sth都是“在做某事方面有麻烦”，problems, trouble,difficulty都是名词 find adj to do sth是发现做某事怎么样，中间是形容词啊