I'll be sightseeing you'll be sightseeing he'll be sightseeing we'll be sightseeing you'll be sightseeing they'll be sightseeing
Future perfect
I'll have sightseed you'll have sightseed he'll have sightseed we'll have sightseed you'll have sightseed they'll have sightseed
Future perfect continuous
I'll have been sightseeing you'll have been sightseeing he'll have been sightseeing we'll have been sightseeing you'll have been sightseeing they'll have been sightseeing
I'd be sightseeing you'd be sightseeing he'd be sightseeing we'd be sightseeing you'd be sightseeing they'd be sightseeing
Past
I'd have sightseed you'd have sightseed he'd have sightseed we'd have sightseed you'd have sightseed they'd have sightseed
Past continuous
I'd have been sightseeing you'd have been sightseeing he'd have been sightseeing we'd have been sightseeing you'd have been sightseeing they'd have been sightseeing