I'll be retaining you'll be retaining she'll be retaining we'll be retaining you'll be retaining they'll be retaining
Future perfect
I'll have retained you'll have retained she'll have retained we'll have retained you'll have retained they'll have retained
Future perfect continuous
I'll have been retaining you'll have been retaining she'll have been retaining we'll have been retaining you'll have been retaining they'll have been retaining
I'd be retaining you'd be retaining she'd be retaining we'd be retaining you'd be retaining they'd be retaining
Past
I'd have retained you'd have retained she'd have retained we'd have retained you'd have retained they'd have retained
Past continuous
I'd have been retaining you'd have been retaining she'd have been retaining we'd have been retaining you'd have been retaining they'd have been retaining