Questions & Answers about Jakar barci tana cikin tanti.
In this sentence, tana is the part that corresponds most closely to English is.
More precisely, it is a feminine singular present/imperfective marker. Hausa uses this kind of form not only for ongoing actions, but also for current states and location, so tana cikin tanti means is in the tent or is inside the tent.
Because Hausa often changes the first noun when it is followed by another noun in a possessive or descriptive noun-noun construction.
Here, jaka means bag, but before barci it becomes jakar. That -r is a linking form. So jakar barci literally means bag of sleep, which is how Hausa expresses sleeping bag.
No. Barci is a noun, meaning sleep.
Hausa often uses noun + noun combinations where English uses an adjective or an -ing form. So instead of saying something like sleeping bag with an adjective-like word, Hausa says bag of sleep: jakar barci.