ought to stem
Verbo regular: stem - stemmed- stemmed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I ought to stem
you ought to stem
he ought to stem
we ought to stem
you ought to stem
they ought to stem 	I ought to be stemming
you ought to be stemming
he ought to be stemming
we ought to be stemming
you ought to be stemming
they ought to be stemming	I ought to have stemmed
you ought to have stemmed
he ought to have stemmed
we ought to have stemmed
you ought to have stemmed
they ought to have stemmed	I ought to have been stemming
you ought to have been stemming
he ought to have been stemming
we ought to have been stemming
you ought to have been stemming
they ought to have been stemming	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I ought not to stem
you ought not to stem
he ought not to stem
we ought not to stem
you ought not to stem
they ought not to stem 	I ought not to stemming
you ought not to stemming
he ought not to stemming
we ought not to stemming
you ought not to stemming
they ought not to stemming	I ought not to have stemmed
you ought not to have stemmed
he ought not to have stemmed
we ought not to have stemmed
you ought not to have stemmed
they ought not to have stemmed	I ought not to have been stemming
you ought not to have been stemming
he ought not to have been stemming
we ought not to have been stemming
you ought not to have been stemming
they ought not to have been stemming	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
ought to I stem?
ought to you stem?
ought to he stem?
ought to we stem?
ought to you stem?
ought to they stem? 	ought to I be stemming?
ought to you be stemming?
ought to he be stemming?
ought to we be stemming?
ought to you be stemming?
ought to they be stemming? 	ought to I have stemmed?
ought to you have stemmed?
ought to he have stemmed?
ought to we have stemmed?
ought to you have stemmed?
ought to they have stemmed? 	ought to I have been stemming?
ought to you have been stemming?
ought to he have been stemming?
ought to we have been stemming?
ought to you have been stemming?
ought to they have been stemming? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
ought I not to stem?
ought you not to stem?
ought he not to stem?
ought we not to stem?
ought you not to stem?
ought they not to stem? 	ought I not to be stemming?
ought you not to be stemming?
ought he not to be stemming?
ought we not to be stemming?
ought you not to be stemming?
ought they not to be stemming? 	ought I not to have stemmed?
ought you not to have stemmed?
ought he not to have stemmed?
ought we not to have stemmed?
ought you not to have stemmed?
ought they not to have stemmed? 	ought I not to have been stemming?
ought you not to have been stemming?
ought he not to have been stemming?
ought we not to have been stemming?
ought you not to have been stemming?
ought they not to have been stemming?