Is it legal to make a compilation of scenes of famous movies for teaching English language

While copyright law is not my particular field of endeavor, the purpose of copyright law is to prevent theft.  For-profit of another persons work product, namely the artistic production.  There is a concept.  However, that is known as "the fair use doctrine."  As I understand this doctrine, it permits limited use of small parts of copyrighted material for educational purposes.  That said, it might not be a bad idea to contact the agencies and/or studios that hold and/or protect the copyrights, present them with your proposal, and get written authority.  That will eliminate any risk.