can skulk
Regular verb: skulk - skulked- skulked

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

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

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

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