I'll be despairing you'll be despairing he'll be despairing we'll be despairing you'll be despairing they'll be despairing
Future perfect
I'll have despaired you'll have despaired he'll have despaired we'll have despaired you'll have despaired they'll have despaired
Future perfect continuous
I'll have been despairing you'll have been despairing he'll have been despairing we'll have been despairing you'll have been despairing they'll have been despairing
I'd be despairing you'd be despairing he'd be despairing we'd be despairing you'd be despairing they'd be despairing
Past
I'd have despaired you'd have despaired he'd have despaired we'd have despaired you'd have despaired they'd have despaired
Past continuous
I'd have been despairing you'd have been despairing he'd have been despairing we'd have been despairing you'd have been despairing they'd have been despairing