Can anyone help me with this question and explain me the reason?
If the weather ……. Fine tomorrow, I will go for a walk.
If the weather is fine tomorrow, I will go for a walk. This is an "If clause type I".
Future tense of the verb is allowed only in the main sentence in this type of conditional clause.
ex.I will visit my aunt if she invites me.
She will pass her exam if she studies hard.
if is not followed by will.In all conditional sentences.This is a 1st type conditional sentence.
There is only one case we can use will in the if-clause:to express refusal, polite request, willingness, insistence.
If they won't take no as an answer, we will have to reconsider.(refusal)
If you will give me the details, I will look at it.(polite request)
If she will wait a moment,I will sort it out.(willingness)
If you will try to do it all at the last moment, I can't help you.( insistence)
If you would give me the details, I will look at it.(polite request)
***In all these cases the person concerned is able to control an outcome. For example in the following sentence we cannot use will in the If-clause:If she finds the watch, she will be allowed to keep it.
***the main clause is as the 1st type conditional as you see: you can put will, a modal or imperative.