tolong buatin dialog tentang expression of obligation. tema : your friend always get the bed value of math lesson

Andra : hey , you get the bed value of math lesson again?
Fika    : ehm , yes .
andra : are you study last night?
fika : no , im so tired.
andra : you must study .
fika : i must study?
andra : yes , if you study hard , you will get the great value of math lesson .
fika : i doubt that
andra : you must get the great value of math lesson