____ the help of my classmates,I've improved my English

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____ the help of my classmates,I've improved my English
可不可以说是For the help of my classmates,I've improved my English.这里的For 表原因,而help作名词,我觉得For也可以啊,答案用with,有哪位达人解释下为什么不能用for吗?
刚刚看了部分网友的回答，还是半懂的样子，

for作“因为”的意思时,充当连词（conj.）,连接两个句子,而这里需要的是介词,
所以这里不能用for；
with the help of （固定搭配）
在……的帮助下
e.g.
With the help of a passer-by,I carried the injured person into a shop.
在一个过路人的帮助下,我把伤者抬进了一家商店.
再问： for也有做介词的时候啊？怎么说for the help of my classmates中的for就是连词啊？
再答： for充当介词表示原因时，不能位于句首。 e.g.Thank you for sending me a gift. (对） *这里的for就表示原因，但它必须位于句中。不懂再问哦
再问：有个句子 For several reasons, I’d rather not meet her. 由于种种原因，我宁愿不见她。这个句子是刚刚再网上找的，此时的For是连词，还是介词？为什么置于了句首没有出错？
再答：嗯，您的精神可嘉，挺细心。不知道这样解释您能接受吗除了for，还有一个due to,也表示因为，在高中，老师反复强调，due to不能于句首，一律用owing to. 但是，表示突出强调时，for 、due to在非正式场合（我们就活在非正式场合O(∩_∩)O ）下，是可以这样用的，故老师们称之为“不严谨”。但是考试的时候，有最佳答案，一定要选最佳答案，不要钻牛角尖。希望祝您理解

____ the help of my classmates,I've improved my English With the help of our teacher,my English has improved in a r_ with the (teacher)help,my english is improved quickly. with the teachers'help,my english is improved quickly 请问is i ____ the help of my teacher ,I am able to speak English very 【With the help of 】my friends,I caught up with my classmates with our english teacher's help ,i have improved my english. With our English teacher's help,I have improved my English.( With our English tecaher,s help I have improved.My English（改 I should have my english grammar improved 句型转换With our English teacher's help,I have improved my Engli ____________,I've caught up with my classmates in my English