English » Spotting Errors

The following sentence has been split into four segments. Identify the segment that contains a grammatical error.

Holiday homework / are essential to keeping / students busy / during the vacation.

A

are essential to keeping

B

during the vacation

C

students busy

D

Holiday homework

Solution

the error lies in option A 

are essential to keeping should be replaced with is essential to keep

Subject verb agreement rule:

The basic rule states that a singular subject takes a singular verb while a plural subject takes a plural verb.

here the given subject is singular,