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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