Question

each of the boys in the class have finished their tasks (spot the error)​

Answer 1

each of the boys in the class had finished their work

Answer 2

Answer:

Have - incorrect

Has - correct.

Explanation:

because

☆ each of the

☆one of the

☆none of the

☆very few of the

☆ many of the

after this [above mentioned] words there should be NOUN - Plural , VERB- singular.