1) The teacher wants the students to work hard.
2) The teachers wants the students to work hard.
3) The teacher’s wants the students to work hard.
4) The teacher want the students to work hard.
5) None of these
Rule ⇒ Make a verb agree in number with its subject; make a pronoun agree in number with its antecedent. Here, subject is ‘teacher’, so verb will be in agreement with teacher. Teacher …. wants Teachers …. want