should skulk
Regular verb: skulk - skulked- skulked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd skulk
you'd skulk
he'd skulk
we'd skulk
you'd skulk
they'd skulk 	I'd be skulking
you'd be skulking
he'd be skulking
we'd be skulking
you'd be skulking
they'd be skulking	I should've skulked
you should've skulked
he should've skulked
we should've skulked
you should've skulked
they should've skulked	I should've been skulking
you should've been skulking
he should've been skulking
we should've been skulking
you should've been skulking
they should've been skulking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't skulk
you shouldn't skulk
he shouldn't skulk
we shouldn't skulk
you shouldn't skulk
they shouldn't skulk 	I shouldn't be skulking
you shouldn't be skulking
he shouldn't be skulking
we shouldn't be skulking
you shouldn't be skulking
they shouldn't be skulking	I shouldn't have skulked
you shouldn't have skulked
he shouldn't have skulked
we shouldn't have skulked
you shouldn't have skulked
they shouldn't have skulked	I shouldn't have been skulking
you shouldn't have been skulking
he shouldn't have been skulking
we shouldn't have been skulking
you shouldn't have been skulking
they shouldn't have been skulking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I skulk?
should you skulk?
should he skulk?
should we skulk?
should you skulk?
should they skulk? 	should I be skulking?
should you be skulking?
should he be skulking?
should we be skulking?
should you be skulking?
should they be skulking? 	should I have skulked?
should you have skulked?
should he have skulked?
should we have skulked?
should you have skulked?
should they have skulked? 	should I have been skulking?
should you have been skulking?
should he have been skulking?
should we have been skulking?
should you have been skulking?
should they have been skulking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I skulk?
shouldn't you skulk?
shouldn't he skulk?
shouldn't we skulk?
shouldn't you skulk?
shouldn't they skulk? 	shouldn't I be skulking?
shouldn't you be skulking?
shouldn't he be skulking?
shouldn't we be skulking?
shouldn't you be skulking?
shouldn't they be skulking? 	shouldn't I have skulked?
shouldn't you have skulked?
shouldn't he have skulked?
shouldn't we have skulked?
shouldn't you have skulked?
shouldn't they have skulked? 	shouldn't I have been skulking?
shouldn't you have been skulking?
shouldn't he have been skulking?
shouldn't we have been skulking?
shouldn't you have been skulking?
shouldn't they have been skulking?