except的用法是一定要ing形式吗讲清楚原因要确定是对的

Question

except的用法
是 一定要 ing 形式吗
讲清楚原因 要确定是对的

Answer 1

Except这个词比较复杂,值得跟大家详细解答交流.
首先,你的例句比：He could do nothing except______(watch) TV.
其中,do+动名词 的结果决定了后面的填空也必须用动名词,即watching.
另一个类似的句子是,
Tom does everything around the house except cook.
这里cook是跟does平行的.但如想跟everything平行,也能用cooking.
同理,你的句子里也能用watch.
其它用法是：
Longman Dictionary of Contemporary English里届时,except既可作preposition,也可作conjunction..如作为介词,后面当然也只能跟动名词,如该词典给的例句：
Mike's sister is almost good at everything except ironing.
英文说明：The choice of -ing form of the verb after except is determined by a word or phrase coming earlier in the sentence; in this case good at,which normally takes an -ing form.
而在另一本词典里(Collins Cobuild) ,由于动词是not do,所以后面的结构就要跟to+不定式.
Ida would not speak to him except to answer questions.
在以下这个例句中：
The graduate student had nothing in mind except ____ his thesis.
(A) finishing (B) finish (C) finished (D) to finish
--------本应选A.但如果加了to do,如下句
The graduate student had nothing to do except finish his thesis.就要选B,即finish了.
此外,except后面也可加从句：
I didn't tell him anything except that I needed the money.
其中,except可与save对换,这是后话.