Indicative, imperative, subjunctiveand infinitive are the four moods of English verbs. All manners and moods are expressed through these four verbs.
While verb tenses (present, past and future) are used to talk about time, the four mood verbs show states, attitudes and reality.
Indicative Mood
We use the indicative mood to express:
Assertion - Heathrow is the world's busiest airport.
Denial - Oliver cannot speak English.