A. We use will with the basic form of the verb. We do not use to with the verb after will and we do not add -s, -ing or -ed to the verb after will:
A Sarita goes to work every day.
She is always there from 8.30 until 4.30.
It is 11 o'clock now. Sarita is at school.
At 11 o'clock yesterday, she was at school.
At 11 o'clock tomorrow, she will be at school.
B. We can use shall or will after I and we:
We shall probably go to London next week.