I could sightsee you could sightsee she could sightsee we could sightsee you could sightsee they could sightsee
Forme en V-ing
I could be sightseeing you could be sightseeing she could be sightseeing we could be sightseeing you could be sightseeing they could be sightseeing
Perfect
I could have sightseed you could have sightseed she could have sightseed we could have sightseed you could have sightseed they could have sightseed
Perfect en V-ing
I could have been sightseeing you could have been sightseeing she could have been sightseeing we could have been sightseeing you could have been sightseeing they could have been sightseeing
Négation
Forme simple
I couldn't sightsee you couldn't sightsee she couldn't sightsee we couldn't sightsee you couldn't sightsee they couldn't sightsee
Forme en V-ing
I couldn't be sightseeing you couldn't be sightseeing she couldn't be sightseeing we couldn't be sightseeing you couldn't be sightseeing they couldn't be sightseeing
Perfect
I couldn't have sightseed you couldn't have sightseed she couldn't have sightseed we couldn't have sightseed you couldn't have sightseed they couldn't have sightseed
Perfect en V-ing
I couldn't have been sightseeing you couldn't have been sightseeing she couldn't have been sightseeing we couldn't have been sightseeing you couldn't have been sightseeing they couldn't have been sightseeing
Forme interrogative
Forme simple
could I sightsee? could you sightsee? could she sightsee? could we sightsee? could you sightsee? could they sightsee?
Forme en V-ing
could I be sightseeing? could you be sightseeing? could she be sightseeing? could we be sightseeing? could you be sightseeing? could they be sightseeing?
Perfect
could I have sightseed? could you have sightseed? could she have sightseed? could we have sightseed? could you have sightseed? could they have sightseed?
Perfect en V-ing
could I have been sightseeing? could you have been sightseeing? could she have been sightseeing? could we have been sightseeing? could you have been sightseeing? could they have been sightseeing?
Forme interro-négative
Forme simple
couldn't I sightsee? couldn't you sightsee? couldn't she sightsee? couldn't we sightsee? couldn't you sightsee? couldn't they sightsee?
Forme en V-ing
couldn't I be sightseeing? couldn't you be sightseeing? couldn't she be sightseeing? couldn't we be sightseeing? couldn't you be sightseeing? couldn't they be sightseeing?
Perfect
couldn't I have sightseed? couldn't you have sightseed? couldn't she have sightseed? couldn't we have sightseed? couldn't you have sightseed? couldn't they have sightseed?
Perfect en V-ing
couldn't I have been sightseeing? couldn't you have been sightseeing? couldn't she have been sightseeing? couldn't we have been sightseeing? couldn't you have been sightseeing? couldn't they have been sightseeing?