ought to skulk
Regular verb: skulk - skulked- skulked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to skulk
you ought to skulk
he ought to skulk
we ought to skulk
you ought to skulk
they ought to skulk 	I ought to be skulking
you ought to be skulking
he ought to be skulking
we ought to be skulking
you ought to be skulking
they ought to be skulking	I ought to have skulked
you ought to have skulked
he ought to have skulked
we ought to have skulked
you ought to have skulked
they ought to have skulked	I ought to have been skulking
you ought to have been skulking
he ought to have been skulking
we ought to have been skulking
you ought to have been skulking
they ought to have been skulking	

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

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

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