Look at these statements about if - clauses. which are true and which are false? 1. when referring to the future, we usually use will or would in the if -clause.
2. the verb form in unreal if - clauses is further in the past than in the time reference.
3. unreal if - clauses, tense and time correspond.
4. there is no differenice in form between present and future if - clauses - only context can tell us which time period is being referred to