Desde as "Since"

Question 1

Desde + present tense verb =

Answer 1

“Has ” + verb + since
(Present tense)

Example:
“Mi tío está aquí desde enero.”
My uncle has worked here since January.
My uncle has been working here since January.

Question 2

Desde+ imperfect tense verb =

Answer 2

“Had” + verb + since
(Past Perfect tense)

Example:
“Trabajaban en esa fábrica desde junio.”
They had worked in that factory since June.
They had been working in that factory since June