The category of aspect

It is the form of the verb which shows the character of the action from the point of view of its progress or its completion.
ASPECT

The perfective
Прочитал
Сделал
Non-perfective
Читал
Сделал
There are two aspects in the Russian language which differ both in form and in meaning:

As there are no such clear-cut distinctions between English verbs, many foreign grammarians are of the opinion that such a category does not exist in the English language.
They speak of only tense distinctions and thus find four groups of tenses:
Indefinite
Continuous,
Perfect
Perfect continuous

Russian grammarians recognize the existence of such a category in the English verb and say that aspect in English may be expressed in two ways: by lexical and grammatical means.

By lexical means they understand the lexical character of the verb. It’s a well-known fact that English verbs fall under two classes:
terminative (those which denote an action implying a certain limit beyond which it cannot go: to come, to stop, to complete, etc.)
durative (those which denote an action which does not imply any limit, that is without an end in view: to study, to carry, to keep, etc.)

On the other hand, our grammarians claim that aspect distinctions in English may be expressed by means of grammatical forms.
The most widely spread view on this point is that the category of aspect is expressed through the opposition of continuous/ non-continuous (or common) aspect forms (asks- is asking) in which the Common aspect is the unmarked member, whereas the Continuous aspect is marked, its marker is the combination “be + ing”.