This tense is used:
1. When we say about an action that will be in progress at a stated future time.
This time next week, I will be swimming in the sea.
2. When we say about an action that will definitely happen in the future as the result of a routine or arrangement.
- Shall I inform other people about our decision?
- No, I will be seeing them at the meeting.
3. When we ask politely about someone's plans for the near future.
- Will you be going out later?
- Yes.
- Could you buy me pizza, please?
There are different types of sentences.
Positive Subject + will be + Ving
NegativeSubject + will + not + be + Ving
QuestionsWill + subject + be + Ving?
When you add the ending -ing, don't forget about spelling rules.
Exceptions in Spelling
final 'e' is dropped (but: 'ee' is not changed)come – coming   
(but: agree – agreeing)
after a short, stressed vowel, the final consonant is doubledsit – sitting
'L' as final consonant after a vowel is doubled (in British English)travel – travelling
final 'ie' becomes 'y'lie – lying