except

except /ikˈsept/ prep.除…以外 （跟名词/代词、介词短语和从句）: He answered all the questions except the last one. 除最后一题外，他回答了所有的问题。We went there every day except Sunday. 除星期天外，我们天天去那里。He usually goes to work on his bike except on rainy days. 除了雨天，他一般都骑自行车上班。He never came except when he was in trouble. 除了遇到麻烦的时候，他从不到这里来。This suit fits me well except that the trousers are too long. 这套衣服我穿着很合身，只不过裤子太长了。except for除了(因为)；要不是：His composition is well written except for a few mistakes in the last paragraph.他的作文写得很好，只是最后一段有些错误。 Except for an old lady, the bus was empty. 除了一位老太太外，公共汽车内空无一人。［考句］The older New England villages have changed relatively little except for a gas station or two in recent decades.在最近几十年里，新英格兰地区古老村庄除出现了一两个加油站外，相对没有什么变化。

［辨析］except是“除去…”的意思，是在整体中除去一部分，句型往往是no/nobody/nothing/nowhere...或all/every...except；besides是“除…之外，另外还有”的意思，相当于in addition to 。请比较：All are present except Helen. 除海伦外，大家都到了(海伦未到)。Two others were on duty besides/in addition to Helen. 除海伦外，还有两个人值日(海伦和另外两个人都值日)。except for 则表示非同类事物或行为的排除，前面不会出现no或all等单词。