I'll be narrowing you'll be narrowing she'll be narrowing we'll be narrowing you'll be narrowing they'll be narrowing
Future perfect
I'll have narrowed you'll have narrowed she'll have narrowed we'll have narrowed you'll have narrowed they'll have narrowed
Future perfect continuous
I'll have been narrowing you'll have been narrowing she'll have been narrowing we'll have been narrowing you'll have been narrowing they'll have been narrowing
I'd be narrowing you'd be narrowing she'd be narrowing we'd be narrowing you'd be narrowing they'd be narrowing
Past
I'd have narrowed you'd have narrowed she'd have narrowed we'd have narrowed you'd have narrowed they'd have narrowed
Past continuous
I'd have been narrowing you'd have been narrowing she'd have been narrowing we'd have been narrowing you'd have been narrowing they'd have been narrowing