can quarterback
Regular verb: quarterback - quarterbacked- quarterbacked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can quarterback
you can quarterback
she can quarterback
we can quarterback
you can quarterback
they can quarterback 	I can be quarterbacking
you can be quarterbacking
she can be quarterbacking
we can be quarterbacking
you can be quarterbacking
they can be quarterbacking	I can have quarterbacked
you can have quarterbacked
she can have quarterbacked
we can have quarterbacked
you can have quarterbacked
they can have quarterbacked	I can have been quarterbacking
you can have been quarterbacking
she can have been quarterbacking
we can have been quarterbacking
you can have been quarterbacking
they can have been quarterbacking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't quarterback
you can't quarterback
she can't quarterback
we can't quarterback
you can't quarterback
they can't quarterback 	I can't be quarterbacking
you can't be quarterbacking
she can't be quarterbacking
we can't be quarterbacking
you can't be quarterbacking
they can't be quarterbacking	I can't have quarterbacked
you can't have quarterbacked
she can't have quarterbacked
we can't have quarterbacked
you can't have quarterbacked
they can't have quarterbacked	I can't have been quarterbacking
you can't have been quarterbacking
she can't have been quarterbacking
we can't have been quarterbacking
you can't have been quarterbacking
they can't have been quarterbacking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I quarterback?
can you quarterback?
can she quarterback?
can we quarterback?
can you quarterback?
can they quarterback? 	can I be quarterbacking?
can you be quarterbacking?
can she be quarterbacking?
can we be quarterbacking?
can you be quarterbacking?
can they be quarterbacking? 	can I have quarterbacked?
can you have quarterbacked?
can she have quarterbacked?
can we have quarterbacked?
can you have quarterbacked?
can they have quarterbacked? 	can I have been quarterbacking?
can you have been quarterbacking?
can she have been quarterbacking?
can we have been quarterbacking?
can you have been quarterbacking?
can they have been quarterbacking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I quarterback?
can't you quarterback?
can't she quarterback?
can't we quarterback?
can't you quarterback?
can't they quarterback? 	can't I be quarterbacking?
can't you be quarterbacking?
can't she be quarterbacking?
can't we be quarterbacking?
can't you be quarterbacking?
can't they be quarterbacking? 	can't I have quarterbacked?
can't you have quarterbacked?
can't she have quarterbacked?
can't we have quarterbacked?
can't you have quarterbacked?
can't they have quarterbacked? 	can't I have been quarterbacking?
can't you have been quarterbacking?
can't she have been quarterbacking?
can't we have been quarterbacking?
can't you have been quarterbacking?
can't they have been quarterbacking?