1,The manager,made it clear to us that he didn't agree with us,left the meeting room.
1）句子分析——
* 主句：The manager left the meeting room
* 时间状语：made it clear to us that he didn't agree with us
2）句子可以改写为下面两种一是略有区别地从句：
* When he made it clear to us that he didn't agree with us,the manager left the meeting room.经理明确地对我们表示了他不同意我们的意见后（接着）就离开了会议室.
* After he had made it clear to us that he didn't agree with us,the manager left the meeting room.经理明确地对我们表示了他不同意我们的意见以后（稍作停顿）就离开了会议室.
3）错误分析——
* 主句很完整,没有语法错误,意思是“经理离开了会议室”；
* 时间状语是由分词短语充当的,显然分词的逻辑主语应该是句子的主语 the manager,就是说“经理明确的对我们表示了他不同意我们的意见”,make it clear 是由经理作出的,the manager 和动词 make 之间是主谓关系,因此不能用表示动宾关系的过去分词 made 表示,而应该改为现在分词的一般式 making it clear 或者完成式 having made it clear.
4）根据改写过的句子改正如下：
* 改为现在分词的一般式：The manager,making it clear to us that he didn't agree with us,left the meeting room.
* 改为现在分词的完成形式：The manager,having made it clear to us that he didn't agree with us,left the meeting room.
注：第一种是与 left 接踵发生的行为,第二种是发生在 left 以前的行为.
2,I really can't understand you to treat her like that.
understand 后只能跟动名词短语或从句作宾语,而本题中用的却是含有不定式的复合宾语,应该改为——
* 动名词短语的复合结构：I really can't understand your/you treating her like that.
* 宾语从句：I really can't understand that you treat her like that.