英语语法问题student may have a hard time hearing _ the teacher is

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英语语法问题
student may have a hard time hearing _ the teacher is saying.答案说空格处是hearing后面的宾语从句,并且从句中saying后缺宾语,所以填what,但从student到time那已经是完整的句子了,那动词hearing开始的又是什么呢,还有在从句中the teacher is saying不是完整的表语吗,不是的话is saying是什么.看懂我的问题和几个问题没?

答：hearing ...是现在分词短语作状语,表示“在.方面”
其实是in hearing.之省略介词in, 这时的hearing ...是动名词短语.
What sb. is saying. 是名词性从句.表示“某人正在说的话”.作hearing的宾语.
is saying中的is是助动词（不是系动词）,它与V-ing (叫现在分词）构成现在进行时态.（从句也有时态）
现在分词和动名词都属于非谓语动词.
类似的：sb. spends some time (in) doing sth.
sb. have difficulty (in) doing sth.
是同类的句子结构.可以作为句型去记.
本题句可改为：Students may have difficulty (in) understanding what the teacher is saying.
学生们可能听不懂老师在说什么.
问：原句出处?感觉这个hear用词不当：听见?

看懂我的回答和几个回答没?

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