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