1.As it turned out在句中為非限制性定語(yǔ)從句.其中It為形式主語(yǔ),指代as所指代的成分.而非限制性定語(yǔ)從句中的關(guān)系代詞as,就是代指后面的主句my little publication went on to become Student...再如：As we all know...as it turned out= it turned out (as)= it turned out (that my little publication went on to become Student, a national magazine for young people in the U.K.)沒(méi)錯(cuò)，it作為形式主語(yǔ)，代替就是真正的主語(yǔ)（從句）：that my little publication went on to become Student, a national magazine for young people in the U.K.