English verb conjugation
CAN SIGHTSEE

Regular verb: sightsee - sightseed - sightseed

Affirmation

Simple form	V-ing form
I can sightsee you can sightsee she can sightsee we can sightsee you can sightsee they can sightsee	I can be sightseeing you can be sightseeing she can be sightseeing we can be sightseeing you can be sightseeing they can be sightseeing
Perfect	V-ing perfect
I can have sightseed you can have sightseed she can have sightseed we can have sightseed you can have sightseed they can have sightseed	I can have been sightseeing you can have been sightseeing she can have been sightseeing we can have been sightseeing you can have been sightseeing they can have been sightseeing

Negation

Simple form	V-ing form
I can't sightsee you can't sightsee she can't sightsee we can't sightsee you can't sightsee they can't sightsee	I can't be sightseeing you can't be sightseeing she can't be sightseeing we can't be sightseeing you can't be sightseeing they can't be sightseeing
Perfect	V-ing perfect
I can't have sightseed you can't have sightseed she can't have sightseed we can't have sightseed you can't have sightseed they can't have sightseed	I can't have been sightseeing you can't have been sightseeing she can't have been sightseeing we can't have been sightseeing you can't have been sightseeing they can't have been sightseeing

Interrogative form

Simple form	V-ing form
can I sightsee? can you sightsee? can she sightsee? can we sightsee? can you sightsee? can they sightsee?	can I be sightseeing? can you be sightseeing? can she be sightseeing? can we be sightseeing? can you be sightseeing? can they be sightseeing?
Perfect	V-ing perfect
can I have sightseed? can you have sightseed? can she have sightseed? can we have sightseed? can you have sightseed? can they have sightseed?	can I have been sightseeing? can you have been sightseeing? can she have been sightseeing? can we have been sightseeing? can you have been sightseeing? can they have been sightseeing?

Interro-negative form

Simple form	V-ing form
can't I sightsee? can't you sightsee? can't she sightsee? can't we sightsee? can't you sightsee? can't they sightsee?	can't I be sightseeing? can't you be sightseeing? can't she be sightseeing? can't we be sightseeing? can't you be sightseeing? can't they be sightseeing?
Perfect	V-ing perfect
can't I have sightseed? can't you have sightseed? can't she have sightseed? can't we have sightseed? can't you have sightseed? can't they have sightseed?	can't I have been sightseeing? can't you have been sightseeing? can't she have been sightseeing? can't we have been sightseeing? can't you have been sightseeing? can't they have been sightseeing?