Verb mood indicates the attitude of the speaker toward the action of the verb. It can be used to express a command (imperative mood), to state a fact (indicative mood), to ask a question (interrogative mood), or to express a wish or hypothetical situation (subjunctive mood). Therefore, if we were to choose the best explanation from the responses given, it would be:
- It is how a verb is used to make a command.
This highlights one specific aspect of verb mood, specifically the imperative mood. However, all the provided options speak to different aspects of verb usage rather than providing a comprehensive explanation of verb mood overall.