Subject-verb agreement The students elected to lead our school beautification committee has several inspiring ideas including a mural in the gym and the relocation of the garbage cans from near the school entrance to behind the cafeteria

We are supposed to find the error in the sentence concerning subject-verb agreement.

The students elected to lead our school beautification committee HAVE several inspiring ideas including a mural in the gym and the relocation of the garbage cans from near the school entrance to behind the cafeteria.

Explanation:  

What we must realize about the verb "to have" in the sentence is that its subject is not "committee". The ones who have inspiring ideas are actually the students. Therefore, the verb should agree with the subject "students", which is plural. The form "has" is singular, and that is why it is incorrectly used. The correct form is:

The students elected to lead our school beautification committee HAVE several inspiring ideas including a mural in the gym and the relocation of the garbage cans from near the school entrance to behind the cafeteria.

c.to compare several aspects of the tragedy to other worldwide tragedies

with whom will you be coming to the party? this is written correctly.