could kayak
Regular verb: kayak - kayaked- kayaked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could kayak
you could kayak
he could kayak
we could kayak
you could kayak
they could kayak 	I could be kayaking
you could be kayaking
he could be kayaking
we could be kayaking
you could be kayaking
they could be kayaking	I could have kayaked
you could have kayaked
he could have kayaked
we could have kayaked
you could have kayaked
they could have kayaked	I could have been kayaking
you could have been kayaking
he could have been kayaking
we could have been kayaking
you could have been kayaking
they could have been kayaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not kayak
you could not kayak
he could not kayak
we could not kayak
you could not kayak
they could not kayak 	I could not be kayaking
you could not be kayaking
he could not be kayaking
we could not be kayaking
you could not be kayaking
they could not be kayaking	I could not have kayaked
you could not have kayaked
he could not have kayaked
we could not have kayaked
you could not have kayaked
they could not have kayaked	I could not have been kayaking
you could not have been kayaking
he could not have been kayaking
we could not have been kayaking
you could not have been kayaking
they could not have been kayaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I kayak?
could you kayak?
could he kayak?
could we kayak?
could you kayak?
could they kayak? 	could I be kayaking?
could you be kayaking?
could he be kayaking?
could we be kayaking?
could you be kayaking?
could they be kayaking? 	could I have kayaked?
could you have kayaked?
could he have kayaked?
could we have kayaked?
could you have kayaked?
could they have kayaked? 	could I have been kayaking?
could you have been kayaking?
could he have been kayaking?
could we have been kayaking?
could you have been kayaking?
could they have been kayaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not kayak?
could you not kayak?
could he not kayak?
could we not kayak?
could you not kayak?
could they not kayak? 	could I not be kayaking?
could you not be kayaking?
could he not be kayaking?
could we not be kayaking?
could you not be kayaking?
could they not be kayaking? 	could I not have kayaked?
could you not have kayaked?
could he not have kayaked?
could we not have kayaked?
could you not have kayaked?
could they not have kayaked? 	could I not have been kayaking?
could you not have been kayaking?
could he not have been kayaking?
could we not have been kayaking?
could you not have been kayaking?
could they not have been kayaking?