有這樣一道題，是考查except用法的：

A：Does he often come to see you?

B：No，the never comes ________ he is in trouble.

A. except B. except that C. except when D. except for

此題很容易誤選B，因?yàn)楹竺媸且粋€(gè)從句，所以很容易聯(lián)想到except that，其實(shí)此題應(yīng)選C。B，C 兩者之后均接從句，其區(qū)別主要從句意上看：except when中的when有“當(dāng)……時(shí)”之意，而except that則無(wú)此義。比較：

I know nothing about him except that he lives in Paris. 我除知道他住在巴黎外，其他情況一無(wú)所知。

I like her except when she’s angry. 除了她發(fā)怒的時(shí)候，我還是挺喜歡她的。

except作為介詞，后接名詞或代詞(這是基本用法)，除了以上提到的后接that從句和when從句外，以下用法也需注意：

(1) 副詞：She has never come late except recently. 除了最近一段時(shí)間，她從未遲到。

(2) 介詞短語(yǔ)：The window is never opened except in summer. 除了在夏天外，這扇窗戶(hù)從不打開(kāi)。

(3) 不定式(注意是否帶 to)：It had no effect except to make him angry. 除了惹他生氣外，沒(méi)產(chǎn)生任何效果。

There was little we could do except wait. 除了等待我們沒(méi)有什么辦法。

(4) what從句：I know nothing about it except what he told me. 除他告訴我的情況外，我對(duì)此事一無(wú)所知。

(5) where從句：My papers seem to be everywhere except where they ought to be. 我的文件似乎完全不在它們應(yīng)該放置的地方。