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.
We use will:
1. for things that we decide to do now, at the moment of speaking:
Ravi's here. I'll get him some coffee.
The Sun’s shining. I'll go swimming.
Are you going home? I'll call a taxi for you.
2. When we think or believe something about the future:
Anant will probably pass the exam.
In 2020 the population of India will be 140 crore.
3. When we talk about possibility and probability, and after:
I think, I expect, I promise, I hope, I'm sure and similar verbs: