分析下这两个句子的语法

第一句Bob and me 是finalists的同位语 而finalists在to 后是宾语，也就是Bob and me在这里是宾语，所以不能用I
当充当主语的时候就应该用I 看下一句 that both ...did是定语从句，在从句中did是谓语 Bob and I是主语 所以这里应该用I
其实只要注意 作主语时一定只能用I
而有些时候me和I 是可以通用 不过在通用的情况大多用me 所以只要记注 主语一定用I

To the finalists,Bob and me,the last high jump was the most exciting as well as the most difficult.
之所以这里用me，要看这个句子啦。To the finalists,Bob and me也就是To the finalists,to Bob and to me,而to是个介词，介词后面跟宾语，所以用I的宾格形式me
In the early morning the first thing that both my brother and I did was to go to see the pony.
这是一个从句，让我们把这个句子层层剥开：
1。the first thing that both my brother and I did was to go to see the pony.
2。the first thing was to go to see the pony.

由此我们看出both my brother and I did是用来修饰the first thing的，所以这里my brother and I 要用主语形式，所以用I
这样讲你能明白吗，如果还不明白可以随时问我。^-^

To the finalists,Bob and me, me是做to的介词宾语。介词后面只能接宾格代词。（对于Bob和我这两个决赛选手来说）

the first thing that both my brother and I did
我和我哥俩所做的第一件事。th