This is a typical question for non-native speakers who are learning English.
When we use the conditional for present situations that are not real (just assumptions). The construction is:
If (subject) (verb in simple past), (subject) WOULD (verb)
The only exception is the verb "to be". In that case, we ALWAYS should use WERE. It doesn't matter whether the subject is singular or it is "you".
For past situations, also not real:
If (subject) HAD (verb in past participle), (subject) WOULD HAVE (verb)...
Sometimes, being a non-native speaker is good for this type of exams.
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