can yowl
Regular verb: yowl - yowled- yowled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can yowl
you can yowl
he can yowl
we can yowl
you can yowl
they can yowl 	I can be yowling
you can be yowling
he can be yowling
we can be yowling
you can be yowling
they can be yowling	I can have yowled
you can have yowled
he can have yowled
we can have yowled
you can have yowled
they can have yowled	I can have been yowling
you can have been yowling
he can have been yowling
we can have been yowling
you can have been yowling
they can have been yowling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot yowl
you cannot yowl
he cannot yowl
we cannot yowl
you cannot yowl
they cannot yowl 	I cannot be yowling
you cannot be yowling
he cannot be yowling
we cannot be yowling
you cannot be yowling
they cannot be yowling	I cannot have yowled
you cannot have yowled
he cannot have yowled
we cannot have yowled
you cannot have yowled
they cannot have yowled	I cannot have been yowling
you cannot have been yowling
he cannot have been yowling
we cannot have been yowling
you cannot have been yowling
they cannot have been yowling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I yowl?
can you yowl?
can he yowl?
can we yowl?
can you yowl?
can they yowl? 	can I be yowling?
can you be yowling?
can he be yowling?
can we be yowling?
can you be yowling?
can they be yowling? 	can I have yowled?
can you have yowled?
can he have yowled?
can we have yowled?
can you have yowled?
can they have yowled? 	can I have been yowling?
can you have been yowling?
can he have been yowling?
can we have been yowling?
can you have been yowling?
can they have been yowling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not yowl?
can you not yowl?
can he not yowl?
can we not yowl?
can you not yowl?
can they not yowl? 	can I not be yowling?
can you not be yowling?
can he not be yowling?
can we not be yowling?
can you not be yowling?
can they not be yowling? 	can I not have yowled?
can you not have yowled?
can he not have yowled?
can we not have yowled?
can you not have yowled?
can they not have yowled? 	can I not have been yowling?
can you not have been yowling?
can he not have been yowling?
can we not have been yowling?
can you not have been yowling?
can they not have been yowling?