A sentence like
We've known each other since 2015
sounds common and normal.
However, could you explain the possible circumstances of using a sentence with 2 Present Perfect clauses linked by "since" of this kind:
I've become suicidal again since I've worked here
I've been feeling down since you've been gone
I think I can somehow feel the meaning but I'd appreciate a native speaker's advice.
With regards,
Anabel
Best Answer
"I've been feeling down since you've been gone" is odd; you shouldn't really link two present perfect clauses. I think it would be better to say:
"Since you left, I've been feeling down." or "I've felt sad ever since you left." or: "Ever since I started working here, I've felt suicidal."
I think it's more elegant to pinpoint an event after which another event has started to take effect.