What is Tense?
Tense is a method that we use in English to refer to time - past, present and future. Many languages use tenses to talk about time. Other languages have no tenses, but of course they can still talk about time, using different methods.
So, we talk about time in English with tenses. But, and this is a very big but:
Here are some of the terms used in discussing verbs and tenses.
indicative mood expresses a simple statement of fact, which can be positive (affirmative) or negative
interrogative mood expresses a question
imperative mood expresses a command
subjunctive mood expresses what is imagined or wished or possible
Voice shows the relationship of the subject to the action. In the active voice, the subject does the action (cats eat mice). In the passive voice, the subject receives the action (mice are eaten by cats). Among other things, we can use voice to help us change the focus of attention.
Aspect expresses a feature of the action related to time, such as completion or duration. Present simple and past simple tenses have no aspect, but if we wish we can stress with other tenses that: