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