I could surf you could surf he could surf we could surf you could surf they could surf
Forme en V-ing
I could be surfing you could be surfing he could be surfing we could be surfing you could be surfing they could be surfing
Perfect
I could have surfed you could have surfed he could have surfed we could have surfed you could have surfed they could have surfed
Perfect en V-ing
I could have been surfing you could have been surfing he could have been surfing we could have been surfing you could have been surfing they could have been surfing
Négation
Forme simple
I couldn't surf you couldn't surf he couldn't surf we couldn't surf you couldn't surf they couldn't surf
Forme en V-ing
I couldn't be surfing you couldn't be surfing he couldn't be surfing we couldn't be surfing you couldn't be surfing they couldn't be surfing
Perfect
I couldn't have surfed you couldn't have surfed he couldn't have surfed we couldn't have surfed you couldn't have surfed they couldn't have surfed
Perfect en V-ing
I couldn't have been surfing you couldn't have been surfing he couldn't have been surfing we couldn't have been surfing you couldn't have been surfing they couldn't have been surfing
Forme interrogative
Forme simple
could I surf? could you surf? could he surf? could we surf? could you surf? could they surf?
Forme en V-ing
could I be surfing? could you be surfing? could he be surfing? could we be surfing? could you be surfing? could they be surfing?
Perfect
could I have surfed? could you have surfed? could he have surfed? could we have surfed? could you have surfed? could they have surfed?
Perfect en V-ing
could I have been surfing? could you have been surfing? could he have been surfing? could we have been surfing? could you have been surfing? could they have been surfing?
Forme interro-négative
Forme simple
couldn't I surf? couldn't you surf? couldn't he surf? couldn't we surf? couldn't you surf? couldn't they surf?
Forme en V-ing
couldn't I be surfing? couldn't you be surfing? couldn't he be surfing? couldn't we be surfing? couldn't you be surfing? couldn't they be surfing?
Perfect
couldn't I have surfed? couldn't you have surfed? couldn't he have surfed? couldn't we have surfed? couldn't you have surfed? couldn't they have surfed?
Perfect en V-ing
couldn't I have been surfing? couldn't you have been surfing? couldn't he have been surfing? couldn't we have been surfing? couldn't you have been surfing? couldn't they have been surfing?