I've been concertinaing you've been concertinaing he's been concertinaing we've been concertinaing you've been concertinaing they've been concertinaing
I'll be concertinaing you'll be concertinaing he'll be concertinaing we'll be concertinaing you'll be concertinaing they'll be concertinaing
Future perfect
I'll have concertinaed you'll have concertinaed he'll have concertinaed we'll have concertinaed you'll have concertinaed they'll have concertinaed
Future perfect continuous
I'll have been concertinaing you'll have been concertinaing he'll have been concertinaing we'll have been concertinaing you'll have been concertinaing they'll have been concertinaing
I'd be concertinaing you'd be concertinaing he'd be concertinaing we'd be concertinaing you'd be concertinaing they'd be concertinaing
Past
I'd have concertinaed you'd have concertinaed he'd have concertinaed we'd have concertinaed you'd have concertinaed they'd have concertinaed
Past continuous
I'd have been concertinaing you'd have been concertinaing he'd have been concertinaing we'd have been concertinaing you'd have been concertinaing they'd have been concertinaing