I'll be burrowing you'll be burrowing he'll be burrowing we'll be burrowing you'll be burrowing they'll be burrowing
Future perfect
I'll have burrowed you'll have burrowed he'll have burrowed we'll have burrowed you'll have burrowed they'll have burrowed
Future perfect continuous
I'll have been burrowing you'll have been burrowing he'll have been burrowing we'll have been burrowing you'll have been burrowing they'll have been burrowing
I'd be burrowing you'd be burrowing he'd be burrowing we'd be burrowing you'd be burrowing they'd be burrowing
Past
I'd have burrowed you'd have burrowed he'd have burrowed we'd have burrowed you'd have burrowed they'd have burrowed
Past continuous
I'd have been burrowing you'd have been burrowing he'd have been burrowing we'd have been burrowing you'd have been burrowing they'd have been burrowing