How many verb tenses are there in English?

Lesson by Anna Ananichuk, directed by Luke Rotzler. 

Anna Ananichuk explains how thanks to something called grammatical aspect, each of these time periods (present, past, and future) actually divides further. 

Full lesson on TEDEd:

https://ed.ted.com/lessons/how-many-verb-tenses-are-there-in-english-anna-ananichuk