Grammatical aspect in linguistics refers to a feature of the verb having to do with the temporal flow of the described event or state. The typical contrasts of aspect in many languages can be shown using phrases in English. Here are some of the many aspects found in the world's languages:
Habitual: 'I walk home from work.' (every day)
'I would/used to walk home from work.' (past habit)
Perfect: 'I have/had gone to the cinema.'
Imperfect: 'I went to the cinema.'
Imperfective: 'I'm going home.' (the action is in progress)
Perfective: 'I went home.' (the action is finished)
Progressive: 'I am eating.'
Prospective: 'I am about to eat.'
Inceptive: 'I am beginning to eat.'
Continuative: 'I am continuing to eat.'
Terminative: 'I am finishing my meal.'
Inchoative: 'My nose is turning red.' (from the cold)
Cessative: 'I am quitting smoking.'
Pausative: 'I stopped working for a while.'
Resumptive: 'I resumed sleeping.'
Punctual: 'I slept.'
Durative: 'I slept for an hour.'
Delimitative: 'I slept for a while.'
Protractive: 'The argument went on and on.'
Iterative: 'I read the same books again and again.'
In some languages, such as Russian, aspect is more salient than tense in narrative. Russian, like others, marks aspect using special morphology on the verb instead of periphrasis (auxiliaries, adverbs, etc.) as in English. Arabic shows a contrast between dynamic and static aspect (the concepts 'ride' and 'mount' are shown by the same verb, rukubun, static in the former case and dynamic in the latter).
It is important to note that linguistic aspect is distinct from tense,
which pinpoints the time at which an action takes place, and is not
related to its degree of completion (which might be a good way to describe
aspect in layman's terms). Unfortunately, English (which, like most Indo-European languages, hopelessly muddles tense and aspect
in its verb system) is not ideal when attempting to underscore this
An example will be made of the verb "to eat" in Serbian language. In Serbian, the verb exist in perfective and imperfective aspects; it could be translated either as "jesti" (imperfective) or "pojesti" (perfective). Now, each aspect could be used with each tense of Serbian (except present tense). Notice that, in first two examples, what in English language is expressed in two different tenses, in Serbian is expressed in the same tense, but with two different aspects. The second and third pair of examples show how aspects are combined with other tenses.
English is generally considered to have two tenses, present and past, and these are then modified by two aspects, progessive/continuous and perfect. Tenses are then named according to the combination of aspects they posses.
So we have for the present tense:
Present Simple (not progressive/continuous, not perfect)
Present Continuous (progressive, not perfect)
Present perfect (not progressive, perfect)
Present Perfect Continuous (progressive, perfect)
It is to be stressed that these are the structural expressions of aspect and can convey meanings that would be expressed by separate and different aspects in other languages.
As well as the two tenses, English has a certain number of auxiliary verbs called modals and these are combined with the infinitive to convey a variety of meanings, including those normally expressed in other European languages by the future and conditional tenses:
I will see you tomorrow.
I can swim.
When combined with the modal auxiliaries the infinitive form changes to accommodate the same combinations of aspect available for the two tenses:
He can/will/might do (not progressive, not perfect)
He can/wil/might be doing (progressive, not perfect)
He can/will/might have done (not progressive, perfect)
He can/will/might have been doing (progressive, perfect)
In some languages, aspect and tense are very clearly separated, making them
more distinct to their speakers.
There are also a number of languages which care much more about aspect than
tense. Prominent in this category is Chinese, which differentiates a whole
slew of aspects but relies exclusively on (optional) time-words to temporally
pinpoint an action.