How does the Modern Greek verb express future time?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

In Modern Greek, the future tense is expressed by using the particle tha—which originated from the phrase thé[o] na (“I want to”)—followed by a finite verb.1

The construction relies heavily on aspectual differences to convey the nature of the action:

Imperfective aspect: When tha is followed by an imperfective verb form, it signifies an action that is continuous, repeated, or ongoing (e.g., tha grápho means "I will be writing").1
Perfective aspect: When tha is followed by a perfective verb form, it indicates a completed or momentary action (e.g., tha grápso means "I will write [once]").1

This system allows speakers to distinguish between the duration and completion of future events through the choice of the verb's aspectual form.1