I'll be darkening you'll be darkening he'll be darkening we'll be darkening you'll be darkening they'll be darkening
Future perfect
I'll have darkened you'll have darkened he'll have darkened we'll have darkened you'll have darkened they'll have darkened
Future perfect continuous
I'll have been darkening you'll have been darkening he'll have been darkening we'll have been darkening you'll have been darkening they'll have been darkening
I'd be darkening you'd be darkening he'd be darkening we'd be darkening you'd be darkening they'd be darkening
Past
I'd have darkened you'd have darkened he'd have darkened we'd have darkened you'd have darkened they'd have darkened
Past continuous
I'd have been darkening you'd have been darkening he'd have been darkening we'd have been darkening you'd have been darkening they'd have been darkening