Conversation with gugu

I was watching fu and mushroom from the back seat on our way back home..

Fu: gugu, why you today come to popo's house?
Gu replied triumphantly: cos gugu worked very fast today so gugu can go to popo's house
Fu: why uncle didnt come to popo's house?
Gu: cos uncle worked so slowly
Fu speaking sternly with his trademark frown: THEN MUST ASK UNCLE TO WORK FASTER!
Gu agreeing: yeS!
Fu (softly but sincerely): use ur phone?
Gu (surprised): huh?... But uncle is busy now, we call him another day ok?
Fu: hmm.. Ok.