ought to understudy
Regular verb: understudy - understudied- understudied

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to understudy
you ought to understudy
she ought to understudy
we ought to understudy
you ought to understudy
they ought to understudy 	I ought to be understudying
you ought to be understudying
she ought to be understudying
we ought to be understudying
you ought to be understudying
they ought to be understudying	I ought to have understudied
you ought to have understudied
she ought to have understudied
we ought to have understudied
you ought to have understudied
they ought to have understudied	I ought to have been understudying
you ought to have been understudying
she ought to have been understudying
we ought to have been understudying
you ought to have been understudying
they ought to have been understudying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to understudy
you oughtn't to understudy
she oughtn't to understudy
we oughtn't to understudy
you oughtn't to understudy
they oughtn't to understudy 	I oughtn't to be understudying
you oughtn't to be understudying
she oughtn't to be understudying
we oughtn't to be understudying
you oughtn't to be understudying
they oughtn't to be understudying	I oughtn't to have understudied
you oughtn't to have understudied
she oughtn't to have understudied
we oughtn't to have understudied
you oughtn't to have understudied
they oughtn't to have understudied	I oughtn't to have been understudying
you oughtn't to have been understudying
she oughtn't to have been understudying
we oughtn't to have been understudying
you oughtn't to have been understudying
they oughtn't to have been understudying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I understudy?
ought to you understudy?
ought to she understudy?
ought to we understudy?
ought to you understudy?
ought to they understudy? 	ought to I be understudying?
ought to you be understudying?
ought to she be understudying?
ought to we be understudying?
ought to you be understudying?
ought to they be understudying? 	ought to I have understudied?
ought to you have understudied?
ought to she have understudied?
ought to we have understudied?
ought to you have understudied?
ought to they have understudied? 	ought to I have been understudying?
ought to you have been understudying?
ought to she have been understudying?
ought to we have been understudying?
ought to you have been understudying?
ought to they have been understudying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to understudy?
oughtn't you to understudy?
oughtn't she to understudy?
oughtn't we to understudy?
oughtn't you to understudy?
oughtn't they to understudy? 	oughtn't I to be understudying?
oughtn't you to be understudying?
oughtn't she to be understudying?
oughtn't we to be understudying?
oughtn't you to be understudying?
oughtn't they to be understudying? 	oughtn't I to have understudied?
oughtn't you to have understudied?
oughtn't she to have understudied?
oughtn't we to have understudied?
oughtn't you to have understudied?
oughtn't they to have understudied? 	oughtn't I to have been understudying?
oughtn't you to have been understudying?
oughtn't she to have been understudying?
oughtn't we to have been understudying?
oughtn't you to have been understudying?
oughtn't they to have been understudying?