Question

What does indicative, subjunctive and imperative mean?

Answer 1

See explanation.

Explanation:

Those terms are moods of verbs:

Indicative sentence is a sentence which informs about some facts.
Example:

John did not go to work because he was ill.

Subjunctive sentence is a sentence telling about assumptions and hypothetical situations.
Example:

If I won in a lottery, I would buy a new car.

Imperative sentence means giving someone orders or commands:
Example:

Do not lie to me.