Sporadic means not occurring every time - it's a once-in-a-while change.
The word "erratic" is an adjective used to describe a noun as irregular, unsteady, random; prone to unexpected changes.Example uses:The patient has an erratic heartbeat.describes the noun "heartbeat"The receptionist gave erratic and misleading directions to the patient.describes the noun "directions"The unbalanced mind uses erratic logic.describes the noun "logic"His erratic behavior was a concern to the other students.describes the noun "behavior"Springtime temperatures are often erratic, it's cold one minute and warm the next.predicate adjective following the linking verb, restates the subject noun "temperatures"Students who have an erratic attendance record may find themselves disciplined by the principal.describes the compound noun "attendance record"
The plural form is... 'officers in charge'.
His voice boomed as if telling us he was the one in charge. Sheriff Jones was in charge of the operation. The principal is in charge of the students.
Free of charge
a debtor with a dick
The lackluster battle was punctuated by sporadic mortar fire.
to be sporadic and without pattern to be sporadic and without pattern
His aim was sporadic and the bullet holes were scattered randomly.
Shopping without a list may only fulfill sporadic needs. My sporadic shopping helps me to buy in bulk.
We huddled in our trenches, listening to sporadic enemy gunfire.
sporadically
sporadically
Nothing
He came in at 12:00am and said where are my students?
No, "sporadic" is not a preposition. It is an adjective that describes something occurring at irregular intervals or scattered in various locations.
Whatever I say it is
sporadic!