Tense

'Tense' shows when an action happens. In English, they are categorized into three groups. Present, past, and future. Some grammarians believe tenses are created by adding suffixes to the verbs, so it may open the concept of 'mood,' in English.
'Mood' is created by using the inflection of verbs to help express the speaker's attitude toward what they are talking about.
Every tense in English is described into a simple, simple continuous, perfect, and perfect continuous form that is called the aspects of the verbs.