My teacher often helps us on our homework错哪了,为什么

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Myteacheroftenhelpsusonourhomework错哪了,为什么Myteacheroftenhelpsusonourhomework错哪了,为什么Myteacheroftenhelp

My teacher often helps us on our homework错哪了,为什么
My teacher often helps us on our homework错哪了,为什么

My teacher often helps us on our homework错哪了,为什么
My teacher often helps us on our homework.
应该是:My teacher often helps us with our homework.
help sb with sth“帮助某人某事”是固定短语.