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