同学你好，该知识点来自沪江网校《英语零基础直达CET6级考试版》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好：
1、He told me that she would come （come）tomorrow.
would 后面需要跟动词原形；后面没有名词做地点，不需要to。
2、The gardener said that he had cut （cut）that tree down yesterday.
“had +过去分词”是过去完成时的谓语；had 后面不能跟动词三单形式，这样不符合语法。
4、What did he say that he had done（do）?
句意：他说他做了什么？did 是助动词，后面跟动词原形；结合语境，“做什么”发生在“说”之前，“过去的过去”用过去完成时。
5、When did he tell you that ...
did 是助动词，后面跟动词原形。
6、He said that he couldn’t（cannot） understand me.
主句是一般过去时，宾语从句应该用过去的时态；结合语境，这里用一般过去时即可。.
9、Why did you say that you were （be）busy?
对实义动词say 提问，用助动词；you 对应的be 动词是were。
10、He said that he would wait（will wait） for me.
would 后面跟动词原形。

祝学习愉快！