The modal verb will is used with a main verb, or an auxiliary verb to express the future tense. It is also used to show ideas such as willingness, request, probability, etc.
Besides being used to show a future action, will indicates a determination to perform the action.
- All of us will be there as usual.
- They will find their way without a map.
- We will walk all the way there.
Will is used in the second and third persons (you, he, she, it, they) in asking questions.
The negative and contraction forms of will are won’t.
Will is usually contracted to ’ll when used with a subject pronoun (I, we, you, they, he, she, it).
- It will bark if someone passes by.
(The contraction form is not used when something is emphasized.)
- Without emphasis: I won't do it.
- With emphasis: I will not do it.
We use would as a past tense of will or to express an idea such as a habitual behaviour, possibility, probability, etc.