4.124 assumption: 'will' and 'would'

You use 'will' when you are assuming that something is the case, and you do not think there is any reason to doubt it.

Similarly, you use 'will not' or 'won't' when you are assuming that something is not the case.

After 'you', you can use 'would' instead of 'will', if you want to be more polite.