will vs. going to (the formal and informal style)

[bob8964]

Here is an anouncement sample:

“The party will start at 10.00 pm.”

My book says: ‘Will' is used here instead of ‘going to' for a formal style. Now I'd like to know what above anouncement should be changed if we want to expressed in an informal style with ‘going to’.

Thank you!

 

[2010]

Here is an anouncement sample:

“The party will start at 10.00 pm.”

My book says: ‘Will' is used here instead of ‘going to' for a formal style. Now I'd like to know what above anouncement should be changed if we want to expressed in an informal style with ‘going to’.

Thank you!

=== Not a teacher ===

1. At what time will the party begin\start?
Ans: The party will start at 10.00 pm.

2. When is the party going to start?
Ans: The party is going to start at 10.00 pm.

I would prefer using "is going" during a short notice (without a time frame, "mostly").

Note: you can use "going to" as well with the time frame. (but rare)

"will" is used to describe a future event with the time frame.

Formal\informal: I cannot vouch! Both sounds okay to me.