Future simple : We make the decision at the moment of speaking.

• I will go to school tomorrow.
• I won’t go to school tomorrow.
• Will I go to school tomorrow ?

“Be going to” future : To talk about plans that have already been made.

• I am going to go to school tomorrow.
• I am not going to go to school tomorrow.
• Am I going to go to school tomorrow ?

Present continuous : To talk about arrangements.

• I’m going to school tomorrow.
• I’m not going to school tomorrow.
• Am I going to school tomorrow ?