She be’s out on that bike every Sunday
They do be up late chatting
Everyone knows about grammatical tense – it involves placing a situation in time, using inflections and auxiliaries to mark temporal location in the past, present, future, etc. Aspect, though less familiar, also concerns time: specifically, how a speaker views the temporal structure or properties of an action or situation, such as whether it’s complete, habitual, or still in progress.
So for example, in the progressive aspect an action is, was, or will be in progress: am walking, was writing, will be singing. It pairs auxiliary be with a gerund-participle complement (__ing). The terminology can be forbidding, but the structure is familiar.
Then there’s habitual aspect for habitual or repeated events or states. In the past tense, English can use would (She would make tea when we called) or used to (We used to meet daily). In English present tense, habitual aspect is not marked, and is often indicated with adverbs or adverbials: We go there [regularly / all the time].
Irish English, also called Hiberno-English, can express habitual aspect in present tense by enlisting Irish (Gaelic) grammar. In Irish, tá mé (which can contract to táim) means ‘I am’, literally ‘is me’. But bíonn mé (→ bím) means ‘I (habitually) am’ – a different sense of be. The distinction is so intrinsic to Irish that our ancestors refashioned English to incorporate it.