(strictly speaking, the indicative in the subordinate clause doesn't have a tense--it hasn't happened, isn't happening, and may not happen, but the indicative is required because 'if' already carries the conditional sense, so adding a conditional form would be nonsense)
i'm asking more about the verb form in that clause. oliver seems to say that a conditional there would produce nonsense (whereas a non-conditional like "if you let me finish" is not nonsense)
not sure i understand this. so an utterance like:
"if you would just let me finish, ..."
is nonsense?