When asking a teacher for help, is it okay to use お願いします?
For example, asking to check my homework:
宿題をチェックしてお願いします。
To me, "Please check my homework." sounds kind of rude.
Would saying
宿題をチェックしてお願いできますか? (Would it be possible for you to check my homework?)
be any better ?
When you ask somebody senior to you for a favor, you’d better add his / her ”honorable” title, e.g. 先生、先輩、師匠、部長、女将さん、親方 before asking.
And if he or she is your teacher, I would say “先生、宿題をチェックして頂けますか？“ or “先生、宿題のチェックをお願いできますか？“ However the latter sounds somewhat redundant to me.
“チェックしてお願いできますか？” is just like saying “Would you kindly check (my homework) and may I ask?”, and is awkward in Japanese.
These would be more natural:
宿題のチェックをお願いできますか？
noun(チェック) + を + お願いできますか？
宿題をチェックしていただけますか？
verb(して) + いただけますか？
