I'd be sightseeing you'd be sightseeing she'd be sightseeing we'd be sightseeing you'd be sightseeing they'd be sightseeing
Perfect
I should've sightseed you should've sightseed she 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 she 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 she 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 she 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 she 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 she 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 she sightsee? should we sightsee? should you sightsee? should they sightsee?
V-ing form
should I be sightseeing? should you be sightseeing? should she be sightseeing? should we be sightseeing? should you be sightseeing? should they be sightseeing?
Perfect
should I have sightseed? should you have sightseed? should she 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 she 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 she 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 she 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 she 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 she have been sightseeing? shouldn't we have been sightseeing? shouldn't you have been sightseeing? shouldn't they have been sightseeing?