Ответ:

1) I will be riding a bike.

You will be watching a film.

They will be dancing at the contest.

2)Will i be riding a bike?

Will you be watching a film?

Will they be dancing at the contest?

3)I will not be riding a bike.

You will not be watching a film.

They will not be dancing at the contest.

PS. will not можно заменить на won't.

Удачи)