I'll be alternating you'll be alternating he'll be alternating we'll be alternating you'll be alternating they'll be alternating
Future perfect
I'll have alternated you'll have alternated he'll have alternated we'll have alternated you'll have alternated they'll have alternated
Future perfect continuous
I'll have been alternating you'll have been alternating he'll have been alternating we'll have been alternating you'll have been alternating they'll have been alternating
I'd be alternating you'd be alternating he'd be alternating we'd be alternating you'd be alternating they'd be alternating
Past
I'd have alternated you'd have alternated he'd have alternated we'd have alternated you'd have alternated they'd have alternated
Past continuous
I'd have been alternating you'd have been alternating he'd have been alternating we'd have been alternating you'd have been alternating they'd have been alternating