can surf
Regular verb: surf - surfed- surfed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't surf
you can't surf
he can't surf
we can't surf
you can't surf
they can't surf 	I can't be surfing
you can't be surfing
he can't be surfing
we can't be surfing
you can't be surfing
they can't be surfing	I can't have surfed
you can't have surfed
he can't have surfed
we can't have surfed
you can't have surfed
they can't have surfed	I can't have been surfing
you can't have been surfing
he can't have been surfing
we can't have been surfing
you can't have been surfing
they can't have been surfing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I surf?
can't you surf?
can't he surf?
can't we surf?
can't you surf?
can't they surf? 	can't I be surfing?
can't you be surfing?
can't he be surfing?
can't we be surfing?
can't you be surfing?
can't they be surfing? 	can't I have surfed?
can't you have surfed?
can't he have surfed?
can't we have surfed?
can't you have surfed?
can't they have surfed? 	can't I have been surfing?
can't you have been surfing?
can't he have been surfing?
can't we have been surfing?
can't you have been surfing?
can't they have been surfing?