can goof
Regular verb: goof - goofed- goofed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can goof
you can goof
he can goof
we can goof
you can goof
they can goof 	I can be goofing
you can be goofing
he can be goofing
we can be goofing
you can be goofing
they can be goofing	I can have goofed
you can have goofed
he can have goofed
we can have goofed
you can have goofed
they can have goofed	I can have been goofing
you can have been goofing
he can have been goofing
we can have been goofing
you can have been goofing
they can have been goofing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot goof
you cannot goof
he cannot goof
we cannot goof
you cannot goof
they cannot goof 	I cannot be goofing
you cannot be goofing
he cannot be goofing
we cannot be goofing
you cannot be goofing
they cannot be goofing	I cannot have goofed
you cannot have goofed
he cannot have goofed
we cannot have goofed
you cannot have goofed
they cannot have goofed	I cannot have been goofing
you cannot have been goofing
he cannot have been goofing
we cannot have been goofing
you cannot have been goofing
they cannot have been goofing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I goof?
can you goof?
can he goof?
can we goof?
can you goof?
can they goof? 	can I be goofing?
can you be goofing?
can he be goofing?
can we be goofing?
can you be goofing?
can they be goofing? 	can I have goofed?
can you have goofed?
can he have goofed?
can we have goofed?
can you have goofed?
can they have goofed? 	can I have been goofing?
can you have been goofing?
can he have been goofing?
can we have been goofing?
can you have been goofing?
can they have been goofing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not goof?
can you not goof?
can he not goof?
can we not goof?
can you not goof?
can they not goof? 	can I not be goofing?
can you not be goofing?
can he not be goofing?
can we not be goofing?
can you not be goofing?
can they not be goofing? 	can I not have goofed?
can you not have goofed?
can he not have goofed?
can we not have goofed?
can you not have goofed?
can they not have goofed? 	can I not have been goofing?
can you not have been goofing?
can he not have been goofing?
can we not have been goofing?
can you not have been goofing?
can they not have been goofing?