He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略.

He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略.
He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略.

He has been there (for)six months.这句话里 for 的用法 ,以及能不能省略.
for不能省略,它是介词,意思为“为了”.been 是be 的过去分词
has been明显就是现在完成时,
“for+一段时间”表示某个动作（或状态）“持续达.”,
像这句话的意思,就是
他在那里已经呆（停留）了6个月了.
for有很多种用法：
1.表示“当作、作为”.如:
I like some bread and milk for breakfast.我喜欢把面包和牛奶作为早餐.
What will we have for supper?我们晚餐吃什么?
2.表示理由或原因,意为“因为、由于”.如:
Thank you for helping me with my English.谢谢你帮我学习英语.
Thank you for your last letter.谢谢你上次的来信.
Thank you for teaching us so well.感谢你如此尽心地教我们.
3.表示动作的对象或接受者,意为“给……”、“对…… (而言)”.如:
Let me pick it up for you.让我为你捡起来.
Watching TV too much is bad for your health.看电视太多有害于你的健康.
4.表示时间、距离,意为“计、达”.如:
I usually do the running for an hour in the morning.我早晨通常跑步一小时.
We will stay there for two days.我们将在那里逗留两天.
5.表示去向、目的,意为“向、往、取、买”等.如:
Let’s go for a walk.我们出去散步吧.
I came here for my schoolbag.我来这儿取书包.
I paid twenty yuan for the dictionary.我花了20元买这本词典.
6.表示所属关系或用途,意为“为、适于……的”.如:
It’s time for school.到上学的时间了.
Here is a letter for you.这儿有你的一封信.
7.表示“支持、赞成”.如:
Are you for this plan or against it?你是支持还是反对这个计划?
8.用于一些固定搭配中.如:
Who are you waiting for?你在等谁?
For example,Mr Green is a kind teacher.比如,格林先生是一位心地善良的老师.能帮助你的就是这些,

for引导时间状语，个人觉得没有更好~

for在这里是加时间段的
至于能不能省略 for在几乎所有情况下无法省略

不能省略，“for+一段时间”用现在完成时,但可以改成He has been there since six months ago.

for在肯定句中是可以省略的，而在否定句中则不可以省略。如下：
In affirmative sentences with a 'continuity verb' like be live, work.
for is often omitted when the verb is present perfect or past:
Patricia has been here ...

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for在肯定句中是可以省略的，而在否定句中则不可以省略。如下：
In affirmative sentences with a 'continuity verb' like be live, work.
for is often omitted when the verb is present perfect or past:
Patricia has been here (for) a year.
Sometimes for can be omitted in future reference:
I‘ll be (or stay, work) in New York (for) six months.
For cannot be omitted in negative sentences or when it comes at the beginning of a sentence or clause:
I haven't seen him for six years. For six years, he lived abroad.

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