should sightsee
Regular verb: sightsee - sightseed- sightseed

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