20 ! our sister wasn't in class last week. some classmates were late last friday. my friends weren't happy with the results

Our sister wasn't in class last week.
(?) Wasn't our sister in class last week?
Some classmates were late last Friday.
(-) Some classmates weren't late last Friday
(?)Were Some classmates late last Friday?
My friends weren't happy with the results
(?) Weren't my friends happy with the results?
(-)My friends weren't happy with the results