https://www.youtube.com/watch?v=1zWuafmkCJ8&t=18s

https://arnelseverydayenglish.com/future-simple-and-future-continuous/

Be going to

• Subject + Be + going to + base form (I am going to make an cake)
• Be subject + going to base form (Are you going to make an cake?)

Will

• Subject + will + base form ( I will be 5 minutes late、I will not be 5 minutes late)
• Will + subject + base form (Will you be 5 minutes late，只需要交换Subject 和 Will的位置)

Will be doing (future continuous)

• Subject + will + be + doing

1. A future fact(will)

• The sun will set at 9:16 p.m. tonight and will rise at 4:44 a.m. tomorrow.
• This road will be closed for two weeks.

We cannot change a fact. It is something definite.

2. A prediction(will/be going to)

WILL = more formal / often seen in writing

BE GOING TO = less formal / often used in spoken English

• In 100 years humans will live / are going to live on Mars.
• Farmers will spend less time outdoors with the help of robotic farming.
• Drugs to cure all types of cancer will be developed.

Why are there two verbs after WILL? This is an example of the PASSIVE VOICE grammar.

3. A future probability(will)

Usually WILL is used with: I’m sure / I think / Maybe / Perhaps

A: Do you think Amy will like this gift I bought her?