I would have called you up for help had it been possible, but I your phone number then.

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hadn’t had didn’t have shouldn’t have couldn’t have

would call would have called called had called

met was meeting have met would meet

should have called must have called could call would call

must have called would be calling could have been calling should have called

would have called; had called would ring; call would have called; called would ring; had called

gave was giving would give have been giving

must have called would be calling could have been calling should have called

would never have called hadn’t called won’t call wouldn’t be calling

am studying was studying will study would study

given up put up made up used up

had rung you up must run you up would have rung you up would ring you up

was were had been would be

called had called would call would have called

was am had been would be

have forgotten would have lost forgot had lost

would like to would like to have would like to be would like to have attended

watched was watching have watched would watch

hadn't had didn't have shouldn't have couldn't have