Question

One of the boy looks happy.-spot the error

Answer 1

one of the (boy)s looks happy is the error

Answer 2

Error in “One of the boy looks happy”:  

Correct Answer: One of the boys looks happy.  

Explanation:

The noun followed by 'one of the' should always be in plural form. Therefore, in this case, the noun 'boy' in singular form is wrong and not valid. It should be 'One of the boys'.  

Also, according to subject-verb agreement, a singular verb should be used as the noun is singular (one boy).