can yell
Regular verb: yell - yelled- yelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can yell
you can yell
she can yell
we can yell
you can yell
they can yell 	I can be yelling
you can be yelling
she can be yelling
we can be yelling
you can be yelling
they can be yelling	I can have yelled
you can have yelled
she can have yelled
we can have yelled
you can have yelled
they can have yelled	I can have been yelling
you can have been yelling
she can have been yelling
we can have been yelling
you can have been yelling
they can have been yelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot yell
you cannot yell
she cannot yell
we cannot yell
you cannot yell
they cannot yell 	I cannot be yelling
you cannot be yelling
she cannot be yelling
we cannot be yelling
you cannot be yelling
they cannot be yelling	I cannot have yelled
you cannot have yelled
she cannot have yelled
we cannot have yelled
you cannot have yelled
they cannot have yelled	I cannot have been yelling
you cannot have been yelling
she cannot have been yelling
we cannot have been yelling
you cannot have been yelling
they cannot have been yelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I yell?
can you yell?
can she yell?
can we yell?
can you yell?
can they yell? 	can I be yelling?
can you be yelling?
can she be yelling?
can we be yelling?
can you be yelling?
can they be yelling? 	can I have yelled?
can you have yelled?
can she have yelled?
can we have yelled?
can you have yelled?
can they have yelled? 	can I have been yelling?
can you have been yelling?
can she have been yelling?
can we have been yelling?
can you have been yelling?
can they have been yelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not yell?
can you not yell?
can she not yell?
can we not yell?
can you not yell?
can they not yell? 	can I not be yelling?
can you not be yelling?
can she not be yelling?
can we not be yelling?
can you not be yelling?
can they not be yelling? 	can I not have yelled?
can you not have yelled?
can she not have yelled?
can we not have yelled?
can you not have yelled?
can they not have yelled? 	can I not have been yelling?
can you not have been yelling?
can she not have been yelling?
can we not have been yelling?
can you not have been yelling?
can they not have been yelling?