The indicative mood expresses a fact , opinion , or question . Most writing is in the indicative. EX: He is a jerk.
The imperative mood expresses a direct command or request . The subject is usually “you understood.” EX: Don’t be a jerk.
The subjunctive mood expresses a requirement or a desire . The subjunctive is often used after certain verbs or clauses, which are usually followed by the word that . EX: It is essential that he stops being a jerk.