Aspect

1. Introduction
2. Continuative and durative
3. Habitual
4. Iterative
5. Perfective
6. Perfect

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The continuative and durative aspect focuses on the development of the action itself, at the moment in which it is taking place.

    "He's writing a book."

As we see in the example, this aspect type can be indicated by modifying the verb form, that is repeated.