Examples
The nine planets which make up our solar system is not the only one of which we know.
A number of planets has recently been found circling other stars.
The size of the planets found so far compare to Jupiter in size.
Both the teacher and the student has to cooperate.
Either the teacher or the students has to agree.
Either the teachers or the student have to agree.
Math, every student’s terror, and English is the hardest courses.