can muck
Regular verb: muck - mucked- mucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can muck
you can muck
he can muck
we can muck
you can muck
they can muck 	I can be mucking
you can be mucking
he can be mucking
we can be mucking
you can be mucking
they can be mucking	I can have mucked
you can have mucked
he can have mucked
we can have mucked
you can have mucked
they can have mucked	I can have been mucking
you can have been mucking
he can have been mucking
we can have been mucking
you can have been mucking
they can have been mucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot muck
you cannot muck
he cannot muck
we cannot muck
you cannot muck
they cannot muck 	I cannot be mucking
you cannot be mucking
he cannot be mucking
we cannot be mucking
you cannot be mucking
they cannot be mucking	I cannot have mucked
you cannot have mucked
he cannot have mucked
we cannot have mucked
you cannot have mucked
they cannot have mucked	I cannot have been mucking
you cannot have been mucking
he cannot have been mucking
we cannot have been mucking
you cannot have been mucking
they cannot have been mucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I muck?
can you muck?
can he muck?
can we muck?
can you muck?
can they muck? 	can I be mucking?
can you be mucking?
can he be mucking?
can we be mucking?
can you be mucking?
can they be mucking? 	can I have mucked?
can you have mucked?
can he have mucked?
can we have mucked?
can you have mucked?
can they have mucked? 	can I have been mucking?
can you have been mucking?
can he have been mucking?
can we have been mucking?
can you have been mucking?
can they have been mucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not muck?
can you not muck?
can he not muck?
can we not muck?
can you not muck?
can they not muck? 	can I not be mucking?
can you not be mucking?
can he not be mucking?
can we not be mucking?
can you not be mucking?
can they not be mucking? 	can I not have mucked?
can you not have mucked?
can he not have mucked?
can we not have mucked?
can you not have mucked?
can they not have mucked? 	can I not have been mucking?
can you not have been mucking?
can he not have been mucking?
can we not have been mucking?
can you not have been mucking?
can they not have been mucking?