1、except 除…外 将一个或几个人或物从同一类或普通的种类中除外,如:
All came except Tom. (除Tom外,大家都来了)
2、except for 说明整个基本情况后,对细节加以纠正,如:
He is a good man except for hot temper.
(他是个好人,只是脾气暴躁。)
Δtemper和man,非一同范畴,temper只是man的一个侧面。
Your composition is good except for some mistakes.(错误和文章不是一类)
3、except when/ what/ that except后加的为句子,而前面except, except for后跟的为名词、代词等。
Most of the Chinese people usually go to work on the bike except when it rains.
"除了雨天,大多数中国人一般都骑自行车上班。"
I know nothing about it except what I have read in the papers.
"除了在报上读到的以外,我对这件事一无所知。"