Which of the underlined verbs must be changed to maintain verb tense consistency?

There are more private K-8 schools than there are private schools for grades 9-12, so many students who attend private grade school went on to attend a public high school.
the first "are"

the second "are"

attend

went

Explanation:

Verb consistency means that the verbs in the sentence must agree in number (singular/plural) and tense (present/past/future/perfect/progressive).

Verb tense consistency requires that the verbs in clauses of the same sentence agree in tense.

This is, you must not change from one tense to another.

In the sentence "There are more private K-8 schools than there are private schools for grades 9-12, so many students who attend private grade school went on to attend a public high school", the two are and  attend  are in present, while went is in past tense.

Using went, then breakes the consisteny.

Thus, went must be changed to maintain verb tense consistency.

what is life

explanation:

one thousand and one nights, also known as arabian nights is a collection of stories whose basic structure is that of embedded narrative. this technique refers to a main story which works as the common frame - or framing narrative - for the other stories, and then this series of stories which are connected to the main one. this technique can also be referred to as a story within a story. the stories stem from the original tale, some begin and end on their own, some are connected to the previous or following one, by means of questions that are answered in the subsequent tale, or characters which reappear.