“请老师些推荐信”的“写”一般用什么动词？provide？write？ask for? 有没有更好的词啊？谢谢

通常都会用ask ... to write...

比如：在工作面试前请老师写推荐信是个好主意。
It's always a good idea to ask your teacher to write a recommendation letter for you.

或

Could I ask you to write a recommendation letter for me? 我能麻烦您帮我写封推荐信吗？

当然，很多时候都有不同的用法，如果是雇主，可以要求应聘的人请老师写推荐信，这时可以用：ask your teacher to provide a recommendation letter.

ask for 比较personal, 比较贴近人心，provide 比较公事化，商务上用得比较多。

All the three are good!
Example:
Ask your teacher to wirte a reference letter.

ask teacher to write a recommandation letter for me

A Request of Letter of Recommendation ....