I'll be sniggering you'll be sniggering she'll be sniggering we'll be sniggering you'll be sniggering they'll be sniggering
Future perfect
I'll have sniggered you'll have sniggered she'll have sniggered we'll have sniggered you'll have sniggered they'll have sniggered
Future perfect continuous
I'll have been sniggering you'll have been sniggering she'll have been sniggering we'll have been sniggering you'll have been sniggering they'll have been sniggering
I'd be sniggering you'd be sniggering she'd be sniggering we'd be sniggering you'd be sniggering they'd be sniggering
Past
I'd have sniggered you'd have sniggered she'd have sniggered we'd have sniggered you'd have sniggered they'd have sniggered
Past continuous
I'd have been sniggering you'd have been sniggering she'd have been sniggering we'd have been sniggering you'd have been sniggering they'd have been sniggering