Нужны разъяснения по поводу. Complete the sentences in different ways 1) We would all like to know a)if....  . b)when . c)when

a) We would all like to know if you are going to John's party with us.


b) We would all like to know if I could visit this museum without my parents. 


c) We would all like to know when Kate is coming back from her holiday vacation.


d) We would all like to know when you are coming to my home to play with my puppy.