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Future perfect
I'll have sketched you'll have sketched he'll have sketched we'll have sketched you'll have sketched they'll have sketched
Future perfect continuous
I'll have been sketching you'll have been sketching he'll have been sketching we'll have been sketching you'll have been sketching they'll have been sketching
I'd be sketching you'd be sketching he'd be sketching we'd be sketching you'd be sketching they'd be sketching
Past
I'd have sketched you'd have sketched he'd have sketched we'd have sketched you'd have sketched they'd have sketched
Past continuous
I'd have been sketching you'd have been sketching he'd have been sketching we'd have been sketching you'd have been sketching they'd have been sketching