could surf
Regular verb: surf - surfed- surfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could surf
you could surf
he could surf
we could surf
you could surf
they could surf 	I could be surfing
you could be surfing
he could be surfing
we could be surfing
you could be surfing
they could be surfing	I could have surfed
you could have surfed
he could have surfed
we could have surfed
you could have surfed
they could have surfed	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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't surf
you couldn't surf
he couldn't surf
we couldn't surf
you couldn't surf
they couldn't surf 	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	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	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	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I surf?
could you surf?
could he surf?
could we surf?
could you surf?
could they surf? 	could I be surfing?
could you be surfing?
could he be surfing?
could we be surfing?
could you be surfing?
could they be surfing? 	could I have surfed?
could you have surfed?
could he have surfed?
could we have surfed?
could you have surfed?
could they have surfed? 	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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I surf?
couldn't you surf?
couldn't he surf?
couldn't we surf?
couldn't you surf?
couldn't they surf? 	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? 	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? 	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?