Question

Jaffna is the capital city of the Northern Province
of Sri Lanka. (add a question tag)

Answer 1

Answer:

Jaffna is the capital city of the Northern Province

of Sri Lanka , isn't it ?

Answer 2

Answer:

jaffna is the capital of the northern province of Sri lanka isn't it ?

Explanation:

see when we say that add a question tag then see in the sentence that after the subject means jaffna which is the helping verb