Question

Mitali ____________ a beautiful folk song since last week. (learn, present perfect continuous)

Answer 1

Mitali has been learning a beautiful folk song since last week.

Hope it helped

Answer 2

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Rule of Present perfect continuous Tense :-

Subject + has/have + been + v1 + ing + object

Then our sentence is :-

Mitali has been learning a beautiful folk song since last week.

$\huge\fcolorbox{yellow}{green}{\color{lime}{Keep~Learning}}$