could snorkel
Regular verb: snorkel - snorkeled- snorkeled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could snorkel
you could snorkel
he could snorkel
we could snorkel
you could snorkel
they could snorkel 	I could be snorkeling
you could be snorkeling
he could be snorkeling
we could be snorkeling
you could be snorkeling
they could be snorkeling	I could have snorkeled
you could have snorkeled
he could have snorkeled
we could have snorkeled
you could have snorkeled
they could have snorkeled	I could have been snorkeling
you could have been snorkeling
he could have been snorkeling
we could have been snorkeling
you could have been snorkeling
they could have been snorkeling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not snorkel
you could not snorkel
he could not snorkel
we could not snorkel
you could not snorkel
they could not snorkel 	I could not be snorkeling
you could not be snorkeling
he could not be snorkeling
we could not be snorkeling
you could not be snorkeling
they could not be snorkeling	I could not have snorkeled
you could not have snorkeled
he could not have snorkeled
we could not have snorkeled
you could not have snorkeled
they could not have snorkeled	I could not have been snorkeling
you could not have been snorkeling
he could not have been snorkeling
we could not have been snorkeling
you could not have been snorkeling
they could not have been snorkeling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I snorkel?
could you snorkel?
could he snorkel?
could we snorkel?
could you snorkel?
could they snorkel? 	could I be snorkeling?
could you be snorkeling?
could he be snorkeling?
could we be snorkeling?
could you be snorkeling?
could they be snorkeling? 	could I have snorkeled?
could you have snorkeled?
could he have snorkeled?
could we have snorkeled?
could you have snorkeled?
could they have snorkeled? 	could I have been snorkeling?
could you have been snorkeling?
could he have been snorkeling?
could we have been snorkeling?
could you have been snorkeling?
could they have been snorkeling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not snorkel?
could you not snorkel?
could he not snorkel?
could we not snorkel?
could you not snorkel?
could they not snorkel? 	could I not be snorkeling?
could you not be snorkeling?
could he not be snorkeling?
could we not be snorkeling?
could you not be snorkeling?
could they not be snorkeling? 	could I not have snorkeled?
could you not have snorkeled?
could he not have snorkeled?
could we not have snorkeled?
could you not have snorkeled?
could they not have snorkeled? 	could I not have been snorkeling?
could you not have been snorkeling?
could he not have been snorkeling?
could we not have been snorkeling?
could you not have been snorkeling?
could they not have been snorkeling?