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简要回答

for是个英语单词，作为介词意思是为了、对于，作为连词意思为因为。

for是经常用到的一个单词，可以搭配很多的单词使用，用法也多种多样。那么下面我们就来说说for是什么意思。

详细内容

for
英 [fɔː(r) , fə(r)] 美 [fɔːr , fər]
prep. (表示对象、用途等)给，对，供;以帮助;为了;关于
conj. 因为;由于

用法实例
for，作为介词，意思是：为了、对于。
My father would do anything for me and my mother,because he loves his family.我的父亲会为我和我的母亲做一切，因为他爱他的家庭。
for，作为连词，意思为：因为。
用for替换了because，则例句变为My father would do anything for me and my mother,for he loves his family.
I didn't eat much lunch for I'm not hungry at all.
我没有怎么吃午餐，因为我一点也不饿。

because conj. 因为
语气最强，表示因果关系，通常用来回答由 why 引导的疑问句。由 because 引导的分句置于句首时，须用逗号与主句隔开，置于句末时则不用隔开。
Because the traffic is so busy, she failed to arrive at the station on time.
因为路上交通太拥挤，她没能准时赶到车站。
He came back late because there was something wrong with his car.
他回来晚了，因为汽车出了故障。
as conj. 因为，由于
如果所述理由是明显的或者已知的，则用 as 较 because 更为合适。
As it's raining, you'd better stay at home.
既然在下雨，你最好呆在家里。
He puts the ice cream into the fridge immediately, as it melts easily.
他马上把冰激凌放进冰箱，因为它很容易化掉。
for conj. [正式]因为
for 属于并列连词，由它引导的分句表示补充说明性的理由，通常只能置于句末，且必须用逗号与前面的分句隔开。
He must have passed this way, for here are his footprints.
他肯定是从这条路走过去的，这里有他的脚印。
He has to work hard, for he wants to support his family.
因为要养家糊口，他必须努力工作。
since conj. 因为，既然
当所述原因是已知的客观事实或被当作推断的理由时用 since，语气略强于 as。
Since he is absent, let's begin.
既然他不在，我们就开始吧。
Susan must have come back home, since her coat is not in the wardrobe.
苏珊肯定回过家，因为她挂在衣橱里的外套不见了。