A1. In clauses with time words: when, after, until, we often use the present tense forms to talk about the future. In conditional clauses with ‘if’ we often use the present tense forms to talk about the future.
A2. We do not normally use ‘will’ in clauses with ‘if’ or with time words.
A3. but we can use will ‘if’ means a promise or offer.
A4. imagine something: ‘if + past’ (if I found/ if I was/ if we didn’t etc.) but meaning is not past.
A5. We do not normally use ‘would’ in the ‘if-part’ of the sentence. But you can use ‘if ~ would’ when you ask somebody to do something.
A6. In the other part of the sentence (not the if-part) we use would (‘d)/ wouldn’t.
A7. ‘could’ and ‘might’ are also possible.
A8. Do not use when in sentences.