ought to stumble
Regular verb: stumble - stumbled- stumbled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to stumble
you ought to stumble
she ought to stumble
we ought to stumble
you ought to stumble
they ought to stumble 	I ought to be stumbling
you ought to be stumbling
she ought to be stumbling
we ought to be stumbling
you ought to be stumbling
they ought to be stumbling	I ought to have stumbled
you ought to have stumbled
she ought to have stumbled
we ought to have stumbled
you ought to have stumbled
they ought to have stumbled	I ought to have been stumbling
you ought to have been stumbling
she ought to have been stumbling
we ought to have been stumbling
you ought to have been stumbling
they ought to have been stumbling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to stumble
you ought not to stumble
she ought not to stumble
we ought not to stumble
you ought not to stumble
they ought not to stumble 	I ought not to stumbling
you ought not to stumbling
she ought not to stumbling
we ought not to stumbling
you ought not to stumbling
they ought not to stumbling	I ought not to have stumbled
you ought not to have stumbled
she ought not to have stumbled
we ought not to have stumbled
you ought not to have stumbled
they ought not to have stumbled	I ought not to have been stumbling
you ought not to have been stumbling
she ought not to have been stumbling
we ought not to have been stumbling
you ought not to have been stumbling
they ought not to have been stumbling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I stumble?
ought to you stumble?
ought to she stumble?
ought to we stumble?
ought to you stumble?
ought to they stumble? 	ought to I be stumbling?
ought to you be stumbling?
ought to she be stumbling?
ought to we be stumbling?
ought to you be stumbling?
ought to they be stumbling? 	ought to I have stumbled?
ought to you have stumbled?
ought to she have stumbled?
ought to we have stumbled?
ought to you have stumbled?
ought to they have stumbled? 	ought to I have been stumbling?
ought to you have been stumbling?
ought to she have been stumbling?
ought to we have been stumbling?
ought to you have been stumbling?
ought to they have been stumbling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to stumble?
ought you not to stumble?
ought she not to stumble?
ought we not to stumble?
ought you not to stumble?
ought they not to stumble? 	ought I not to be stumbling?
ought you not to be stumbling?
ought she not to be stumbling?
ought we not to be stumbling?
ought you not to be stumbling?
ought they not to be stumbling? 	ought I not to have stumbled?
ought you not to have stumbled?
ought she not to have stumbled?
ought we not to have stumbled?
ought you not to have stumbled?
ought they not to have stumbled? 	ought I not to have been stumbling?
ought you not to have been stumbling?
ought she not to have been stumbling?
ought we not to have been stumbling?
ought you not to have been stumbling?
ought they not to have been stumbling?