Kirti asked , " Why were you talking over phone for so long". convert into indirect speech and explain  how past continuous tense is converted into indirect speech 

Dear student
Kirti asked why I had been talking over phone for so long.
The past continous ' were you talking' changes into past perfect continuous tense ' I had been'.
Past continuous is always changed as past perfect continous tense in indirect speech.
Eg: He was walking - He had been walking.
Regards



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