I'll be shuddering you'll be shuddering he'll be shuddering we'll be shuddering you'll be shuddering they'll be shuddering
Future perfect
I'll have shuddered you'll have shuddered he'll have shuddered we'll have shuddered you'll have shuddered they'll have shuddered
Future perfect continuous
I'll have been shuddering you'll have been shuddering he'll have been shuddering we'll have been shuddering you'll have been shuddering they'll have been shuddering
I'd be shuddering you'd be shuddering he'd be shuddering we'd be shuddering you'd be shuddering they'd be shuddering
Past
I'd have shuddered you'd have shuddered he'd have shuddered we'd have shuddered you'd have shuddered they'd have shuddered
Past continuous
I'd have been shuddering you'd have been shuddering he'd have been shuddering we'd have been shuddering you'd have been shuddering they'd have been shuddering