Be going to VS will

FUTURE PLANS

"Be going to + infinitive" is used to express future actions that are planned.

• She is GOING TO play with me.
• He is GOING TO travel around the world.
• I am GOING TO fall in love!

"Will", is used when we make a decision in the moment without a previous plan.

• I WILL kiss him.
• We WILL take french classes.
• You WILL enjoy your vacation.

PREDICTIONS

"Be going to + infinitive" is used too, to make predictions when we have an idea to do it.

• I have grown up, so I am going to participate in Mexico's Top Model.
• He did not clean his room. He is not going to go with us to the cinema.
• Here is very cold. She thinks, she is going to put a sweater on.

"Will" is used too, to make predictions, but without an idea to do it, this predictions, are the result of the speaker opinion.

• Bring her a flower. She will love that detail.
• We will be happy next year in France.
• They think Mexico will lose.