1)He can not play table tennis, can he?
Can't he play table tennis or football?
2)Do they have a picnic on (что за слово)?
When do they have a picnic?
3)I like to spend my free time with my friends, don't I?
What do I like to do with my friends?
4)Who learns German?
What do learn Noah and Josg?
5) Неверное предложение.