nProblem: Confusion over whether the subject is singular or plural, especially when words come between the subject and the verb OR when the verb comes before the subject
nCause: Verbs must agree with their subjects in number (singular/plural) and in person (1st/2nd/3rd)
n
nIncorrect: The stores opens at 8
am.
nIncorrect: But the line of
customers were blocking traffic.
nIncorrect: The orders given by the
officer was to disperse and to leave
the area.