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