I can sightsee you can sightsee she can sightsee we can sightsee you can sightsee they can sightsee
Forma con V-ing
I can be sightseeing you can be sightseeing she can be sightseeing we can be sightseeing you can be sightseeing they can be sightseeing
Perfecto
I can have sightseed you can have sightseed she can have sightseed we can have sightseed you can have sightseed they can have sightseed
Perfecto con V-ing
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
Negación
Forma simple
I cannot sightsee you cannot sightsee she cannot sightsee we cannot sightsee you cannot sightsee they cannot sightsee
Forma con V-ing
I cannot be sightseeing you cannot be sightseeing she cannot be sightseeing we cannot be sightseeing you cannot be sightseeing they cannot be sightseeing
Perfecto
I cannot have sightseed you cannot have sightseed she cannot have sightseed we cannot have sightseed you cannot have sightseed they cannot have sightseed
Perfecto con V-ing
I cannot have been sightseeing you cannot have been sightseeing she cannot have been sightseeing we cannot have been sightseeing you cannot have been sightseeing they cannot have been sightseeing
Forma interrogativa
Forma simple
can I sightsee? can you sightsee? can she sightsee? can we sightsee? can you sightsee? can they sightsee?
Forma con V-ing
can I be sightseeing? can you be sightseeing? can she be sightseeing? can we be sightseeing? can you be sightseeing? can they be sightseeing?
Perfecto
can I have sightseed? can you have sightseed? can she have sightseed? can we have sightseed? can you have sightseed? can they have sightseed?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
can I not sightsee? can you not sightsee? can she not sightsee? can we not sightsee? can you not sightsee? can they not sightsee?
Forma con V-ing
can I not be sightseeing? can you not be sightseeing? can she not be sightseeing? can we not be sightseeing? can you not be sightseeing? can they not be sightseeing?
Perfecto
can I not have sightseed? can you not have sightseed? can she not have sightseed? can we not have sightseed? can you not have sightseed? can they not have sightseed?
Perfecto con V-ing
can I not have been sightseeing? can you not have been sightseeing? can she not have been sightseeing? can we not have been sightseeing? can you not have been sightseeing? can they not have been sightseeing?