ought to preheat
Verbo regular: preheat - preheated- preheated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I ought to preheat
you ought to preheat
he ought to preheat
we ought to preheat
you ought to preheat
they ought to preheat 	I ought to be preheating
you ought to be preheating
he ought to be preheating
we ought to be preheating
you ought to be preheating
they ought to be preheating	I ought to have preheated
you ought to have preheated
he ought to have preheated
we ought to have preheated
you ought to have preheated
they ought to have preheated	I ought to have been preheating
you ought to have been preheating
he ought to have been preheating
we ought to have been preheating
you ought to have been preheating
they ought to have been preheating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I ought not to preheat
you ought not to preheat
he ought not to preheat
we ought not to preheat
you ought not to preheat
they ought not to preheat 	I ought not to preheating
you ought not to preheating
he ought not to preheating
we ought not to preheating
you ought not to preheating
they ought not to preheating	I ought not to have preheated
you ought not to have preheated
he ought not to have preheated
we ought not to have preheated
you ought not to have preheated
they ought not to have preheated	I ought not to have been preheating
you ought not to have been preheating
he ought not to have been preheating
we ought not to have been preheating
you ought not to have been preheating
they ought not to have been preheating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
ought to I preheat?
ought to you preheat?
ought to he preheat?
ought to we preheat?
ought to you preheat?
ought to they preheat? 	ought to I be preheating?
ought to you be preheating?
ought to he be preheating?
ought to we be preheating?
ought to you be preheating?
ought to they be preheating? 	ought to I have preheated?
ought to you have preheated?
ought to he have preheated?
ought to we have preheated?
ought to you have preheated?
ought to they have preheated? 	ought to I have been preheating?
ought to you have been preheating?
ought to he have been preheating?
ought to we have been preheating?
ought to you have been preheating?
ought to they have been preheating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
ought I not to preheat?
ought you not to preheat?
ought he not to preheat?
ought we not to preheat?
ought you not to preheat?
ought they not to preheat? 	ought I not to be preheating?
ought you not to be preheating?
ought he not to be preheating?
ought we not to be preheating?
ought you not to be preheating?
ought they not to be preheating? 	ought I not to have preheated?
ought you not to have preheated?
ought he not to have preheated?
ought we not to have preheated?
ought you not to have preheated?
ought they not to have preheated? 	ought I not to have been preheating?
ought you not to have been preheating?
ought he not to have been preheating?
ought we not to have been preheating?
ought you not to have been preheating?
ought they not to have been preheating?