should muck
Regular verb: muck - mucked- mucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd muck
you'd muck
she'd muck
we'd muck
you'd muck
they'd muck 	I'd be mucking
you'd be mucking
she'd be mucking
we'd be mucking
you'd be mucking
they'd be mucking	I should've mucked
you should've mucked
she should've mucked
we should've mucked
you should've mucked
they should've mucked	I should've been mucking
you should've been mucking
she should've been mucking
we should've been mucking
you should've been mucking
they should've been mucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't muck
you shouldn't muck
she shouldn't muck
we shouldn't muck
you shouldn't muck
they shouldn't muck 	I shouldn't be mucking
you shouldn't be mucking
she shouldn't be mucking
we shouldn't be mucking
you shouldn't be mucking
they shouldn't be mucking	I shouldn't have mucked
you shouldn't have mucked
she shouldn't have mucked
we shouldn't have mucked
you shouldn't have mucked
they shouldn't have mucked	I shouldn't have been mucking
you shouldn't have been mucking
she shouldn't have been mucking
we shouldn't have been mucking
you shouldn't have been mucking
they shouldn't have been mucking	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I muck?
shouldn't you muck?
shouldn't she muck?
shouldn't we muck?
shouldn't you muck?
shouldn't they muck? 	shouldn't I be mucking?
shouldn't you be mucking?
shouldn't she be mucking?
shouldn't we be mucking?
shouldn't you be mucking?
shouldn't they be mucking? 	shouldn't I have mucked?
shouldn't you have mucked?
shouldn't she have mucked?
shouldn't we have mucked?
shouldn't you have mucked?
shouldn't they have mucked? 	shouldn't I have been mucking?
shouldn't you have been mucking?
shouldn't she have been mucking?
shouldn't we have been mucking?
shouldn't you have been mucking?
shouldn't they have been mucking?