很容易的1 peter really wants to know if he () her when she () ar
很容易的
1 peter really wants to know if he () her when she () arrives at the airport
A finds arrives B finds will arrive C will find will arrive D will find arrives
2didn’t you pay the bill?()my mom will pay it
A yes ,i did B no,i didn’t C yes,i didn’t Dno i did
(解释清楚一点,我想知道if和when,主句用什么时态,从句用什么时态——在这个句子中)