先生にメールを送る必要があります

先生: teacher, dr, doc, sir, doctor, professor, sensei, master, instructor
に: in, to, on, at, into, upon
メール: e, mail, email, messages
を: o, the, to, wo
送る: send, to send, live, ship, lead
必要: need, have, necessary, needed, required, must, want, essential, necessity, indispensable
が: is, there, but, ga, will, however
ある: a, is, an, be, there is, to be, locate
ます: will, to be, i will, to make, to do, to have