# Tammy a connu Tex ______ ses études à Lyon. Would you put “depuis” or “pendant” in the blank? Why?

The correct answer is pendant but that doesn't make sense because Tammy still knows Tex in the present. So wouldn't this be considered an ongoing present action? So depuis should be the answer; not pendant, right?

Here, we are talking about an event (implied by the use of the "passé composé"). You meet someone once, then you know him/her. So here, you refer to the moment you met him, not about the fact you know him at the present. To use depuis, which continues in the present, you would have to change the tense, and so use present, in order to say you are still in touch with him :

Tammy connait Tex depuis sa 3ème année de Fac à Lyon.

We would say "Tammy connaissait Tex depuis..." if we mean Tammy doesn't know Tex anymore, or if one of them is gone.

To use depuis, you have to talk about a precise moment, implicitly saying it was a short period of time:

Tammy connait Tex depuis sa 3ème année de Fac à Lyon.

Note that saying "depuis ses études" sounds weird... Maybe because of the pronom possessif "ses". We would better say "depuis la Fac" for instance, which talks about the same period of life.

Whereas pendant is used when you talk about a period, and implicitly saying it lasted a certain time (it was not brieve).

Here, it is not precise enough to be used with depuis.
Note you could use depuis with those kind of elements :

depuis la maternelle, depuis le lycée, depuis qu'on est enfants, depuis la nuit des temps, depuis qu'on a travaillé ensemble...

Conclusion

Tammy a connu Tex pendant ses études à Lyon