I'll be retarding you'll be retarding he'll be retarding we'll be retarding you'll be retarding they'll be retarding
Future perfect
I'll have retarded you'll have retarded he'll have retarded we'll have retarded you'll have retarded they'll have retarded
Future perfect continuous
I'll have been retarding you'll have been retarding he'll have been retarding we'll have been retarding you'll have been retarding they'll have been retarding
I'd be retarding you'd be retarding he'd be retarding we'd be retarding you'd be retarding they'd be retarding
Past
I'd have retarded you'd have retarded he'd have retarded we'd have retarded you'd have retarded they'd have retarded
Past continuous
I'd have been retarding you'd have been retarding he'd have been retarding we'd have been retarding you'd have been retarding they'd have been retarding