表示一段时间的介词for在什么情况不能省略
在许多情况下，表示一段时的介词for是可以省略的。如：
The meeting lasted (for) three days. 会议持续了3天。
How long are you staying (for)? 你打算呆多久?
We’ve been here (for) six weeks. 我们在这里已经呆了6个星期了。
同时书上注明“有时不省略（比如用于否定句）”——请问：
1. 除了否定句外，还有哪些情况下表示一段时的介词 for 不可以省略。
2. “有时不省略（比如用于否定句）”有理论依据吗？
谢谢！
最佳答案 2015-01-31 15:22
赵振才教授在《英语常见问题解答大词典》增订版部分内容原文如下：当 for 引导的时间短语用来修饰具有静态意义的动词时常常可以省略：
1. They lived in China (for) several years.
2. The meeting lasted (for) two hours.
3. We stayed at the hotel (for) three weeks.
4. He has worked here (for) a year.
5. They will be in Chicago (for) a year.
当 for 与以 all 开头的名词短语连用时，必须省略 for：
She's been lying in bed all day.
但是，当 for 短语修饰动态动词时或者用于否定句时，则介词 for 不能省略。
1. I'm going away for a few days. 我要离开几天。
2. I haven't seen him for three weeks. 我有三个星期没有看见他了。
所以，CGEL 把下列句子看作是错误的：
1. × I taught her three years.
2. × I haven't spoken to her three months.
另外，当 for 用在句子开头时，一般也不能省略：
1. He lived abroad (for) six years. / For six years, he lived abroad. 他在国外住了六年。
2. He waited anxiously at the hospital (for) some time. / For some time, he waited anxiously at the hospital. 他在医院焦急地等了一会儿。
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