Will and Shall ( Future)

When do I use Will?
Quando uso will?

• O will é usado para o futuro do verbo ser/estar (to be ). 

Example:

It's 11: 47 a.m now. I am having lunch.

At 11: 47 a.m yesterday, I was having lunch.

At 11: 47 a.m tomorrow, I will be having lunch.

When do I use "shall"?

 Quando uso "shall"?  

• O Shall é usado como futuro do verbo ser/ estar ( to be). A unica diferença é que o Shall é mais formal que o will.

Example:

I shall be working tomorrow.                                          I will be working tomorrow.

I think we shall be in Maceió next year.                        I think I will be in Maceió next year.