Grammar- The future with will...

Plans:-I´m going to lunch with friends on Friday.
(-)
-I´m not going to do the homework today.
(?)
-Are you going to eat sushi tonight?

-Not Sure:
-I will go to Sierra Vista on Saturday.
(-)
-He´ll need a taxi.
(?)
-Will you go to Bacoachi tomorrow?

-Present continuous:
-I´m going to work till the noon.
(-)
-He´s going to buy a car next month.
(?)
-Are she going to go the supermarket?