文章介绍了一些常见的表意不明的病句和改正方法，包括复杂句子结构、时态和语态错误、用词不当和比较级用法错误等问题。通过纠正这些问题，可以更好地表达自己的意思，避免产生歧义。
病句1：It is what he is doing that I don't like.
这个句子的结构比较复杂，不易理解。正确的表达应该是：I don't like what he is doing.
病句2：I am not used to have breakfast.
这个句子的时态和语态不正确。应该改为：I am not used to having breakfast.
病句3：He took the medicine, but he didn't get better.
这个句子表达的意思是他服用了药物，但是他并没有好转。但是，这个句子的语法结构有误。应该改为：He took the medicine but didn't get better.
病句4：The book is too difficult for me that I cannot understand it.
这个句子的结构也比较复杂。正确的表达应该是：The book is too difficult for me to understand.
病句5：I have a lot of works to do today.
这个句子的用词不正确。正确的表达应该是：I have a lot of work to do today.
病句6：I like to eat pizza more than my sister.
这个句子的比较级用法不正确。正确的表达应该是：I like to eat pizza more than my sister does.
