对的 “He's taller than I,”
错的 “He's taller than me”;
对的 “She's smarter than he,”
错的 “She's smarter than him.”
但问题是,在所有最正式的情况下,“than I“ 的发音很闷,不好听.甚至不地道.大多数人在大多数情况下,把than作为一个介词,并把所有下面的代名词放在objective case,无论是被比较的东西是主体或对象.“he is taller than me“ 的声音更自然,尤其是以英语为母语的大部分人.
所以你的＇she works better than I＂是对的．
ex:My friends and I went to get pizza
你不可以说：
me and my friends went to get pizza
就算多过一个人：
ex:My mom, brother, and I went ice scatting.