should skulk
Regular verb: skulk - skulked- skulked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should skulk
you should skulk
she should skulk
we should skulk
you should skulk
they should skulk 	I should be skulking
you should be skulking
she should be skulking
we should be skulking
you should be skulking
they should be skulking	I should have skulked
you should have skulked
she should have skulked
we should have skulked
you should have skulked
they should have skulked	I should have been skulking
you should have been skulking
she should have been skulking
we should have been skulking
you should have been skulking
they should have been skulking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not skulk
you should not skulk
she should not skulk
we should not skulk
you should not skulk
they should not skulk 	I should not be skulking
you should not be skulking
she should not be skulking
we should not be skulking
you should not be skulking
they should not be skulking	I should not have skulked
you should not have skulked
she should not have skulked
we should not have skulked
you should not have skulked
they should not have skulked	I should not have been skulking
you should not have been skulking
she should not have been skulking
we should not have been skulking
you should not have been skulking
they should not have been skulking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I skulk?
should you skulk?
should she skulk?
should we skulk?
should you skulk?
should they skulk? 	should I be skulking?
should you be skulking?
should she be skulking?
should we be skulking?
should you be skulking?
should they be skulking? 	should I have skulked?
should you have skulked?
should she 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 she 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 	
should I not skulk?
should you not skulk?
should she not skulk?
should we not skulk?
should you not skulk?
should they not skulk? 	should I not be skulking?
should you not be skulking?
should she not be skulking?
should we not be skulking?
should you not be skulking?
should they not be skulking? 	should I not have skulked?
should you not have skulked?
should she not have skulked?
should we not have skulked?
should you not have skulked?
should they not have skulked? 	should I not have been skulking?
should you not have been skulking?
should she not have been skulking?
should we not have been skulking?
should you not have been skulking?
should they not have been skulking?