I'd be sightseeing you'd be sightseeing he'd be sightseeing we'd be sightseeing you'd be sightseeing they'd be sightseeing
Perfect
I should've sightseed you should've sightseed he should've sightseed we should've sightseed you should've sightseed they should've sightseed
V-ing perfect
I should've been sightseeing you should've been sightseeing he should've been sightseeing we should've been sightseeing you should've been sightseeing they should've been sightseeing
Negation
Simple form
I shouldn't sightsee you shouldn't sightsee he shouldn't sightsee we shouldn't sightsee you shouldn't sightsee they shouldn't sightsee
V-ing form
I shouldn't be sightseeing you shouldn't be sightseeing he shouldn't be sightseeing we shouldn't be sightseeing you shouldn't be sightseeing they shouldn't be sightseeing
Perfect
I shouldn't have sightseed you shouldn't have sightseed he shouldn't have sightseed we shouldn't have sightseed you shouldn't have sightseed they shouldn't have sightseed
V-ing perfect
I shouldn't have been sightseeing you shouldn't have been sightseeing he shouldn't have been sightseeing we shouldn't have been sightseeing you shouldn't have been sightseeing they shouldn't have been sightseeing
Interrogative form
Simple form
should I sightsee? should you sightsee? should he sightsee? should we sightsee? should you sightsee? should they sightsee?
V-ing form
should I be sightseeing? should you be sightseeing? should he be sightseeing? should we be sightseeing? should you be sightseeing? should they be sightseeing?
Perfect
should I have sightseed? should you have sightseed? should he have sightseed? should we have sightseed? should you have sightseed? should they have sightseed?
V-ing perfect
should I have been sightseeing? should you have been sightseeing? should he have been sightseeing? should we have been sightseeing? should you have been sightseeing? should they have been sightseeing?
Interro-negative form
Simple form
shouldn't I sightsee? shouldn't you sightsee? shouldn't he sightsee? shouldn't we sightsee? shouldn't you sightsee? shouldn't they sightsee?
V-ing form
shouldn't I be sightseeing? shouldn't you be sightseeing? shouldn't he be sightseeing? shouldn't we be sightseeing? shouldn't you be sightseeing? shouldn't they be sightseeing?
Perfect
shouldn't I have sightseed? shouldn't you have sightseed? shouldn't he have sightseed? shouldn't we have sightseed? shouldn't you have sightseed? shouldn't they have sightseed?
V-ing perfect
shouldn't I have been sightseeing? shouldn't you have been sightseeing? shouldn't he have been sightseeing? shouldn't we have been sightseeing? shouldn't you have been sightseeing? shouldn't they have been sightseeing?