English language consists of various moods and forms. The grammatical moods in a language are very important to understand the tone and correct meaning of a sentence. One such mood is indicative mood.
The nature of a sentence is termed as its mood. The only thing that the nature or mood of a sentence depends on is the verb of a sentence. The form that a verb takes in a sentence helps establish its mood weather it is a query, request or a command.
She is going abroad.
She studied all day long.
In the above sentence, the verb studied is the simple past form of study and it indicates the indicative mood of the sentence as the sentence is giving simple information about the subject and/or stating a simple fact i.e. she studied all day long.
One thing to know is that indicative mood is not defined by the tense that the verb is in in a sentence. In simple terms, an indicative verb can exist as a present, past or future tense. The only thing that makes it indicative is its ability to state facts.
She studied all day long. (Past)
She studies all day long. (Present)
She will study all day long. (Future)