Everyone 
done his or her homework.
Explanation:
Everyone is singular and, therefore, require singular verb.
Hello :))
I would say look from various resources, and if most sources day the smae thing about a particular subject than it shoukd be correct.
Hope this helps
She admits to witchcraft. <span />
As a leader he should have at least considered the advice of
his men especially since they were on the side of caution. Also a good leader must be careful to weigh
the consequences of his actions before he acts.
