有个英文中标点符号的问题想请教各位

有个英文中标点符号的问题想请教各位
"I am" is reportedly the shortest sentence in the English language.Could it be that "I do" is the longest sentence?
以上是George Carlin说的一句名言,我要用作quote,句首和句尾要套引号,但是这样一来句首就看得很变扭.请教下套引号后句中的双引号需不需要变成单引号...