ought to preboil
Regular verb: preboil - preboiled- preboiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to preboil
you ought to preboil
she ought to preboil
we ought to preboil
you ought to preboil
they ought to preboil 	I ought to be preboiling
you ought to be preboiling
she ought to be preboiling
we ought to be preboiling
you ought to be preboiling
they ought to be preboiling	I ought to have preboiled
you ought to have preboiled
she ought to have preboiled
we ought to have preboiled
you ought to have preboiled
they ought to have preboiled	I ought to have been preboiling
you ought to have been preboiling
she ought to have been preboiling
we ought to have been preboiling
you ought to have been preboiling
they ought to have been preboiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought not to preboil
you ought not to preboil
she ought not to preboil
we ought not to preboil
you ought not to preboil
they ought not to preboil 	I ought not to preboiling
you ought not to preboiling
she ought not to preboiling
we ought not to preboiling
you ought not to preboiling
they ought not to preboiling	I ought not to have preboiled
you ought not to have preboiled
she ought not to have preboiled
we ought not to have preboiled
you ought not to have preboiled
they ought not to have preboiled	I ought not to have been preboiling
you ought not to have been preboiling
she ought not to have been preboiling
we ought not to have been preboiling
you ought not to have been preboiling
they ought not to have been preboiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I preboil?
ought to you preboil?
ought to she preboil?
ought to we preboil?
ought to you preboil?
ought to they preboil? 	ought to I be preboiling?
ought to you be preboiling?
ought to she be preboiling?
ought to we be preboiling?
ought to you be preboiling?
ought to they be preboiling? 	ought to I have preboiled?
ought to you have preboiled?
ought to she have preboiled?
ought to we have preboiled?
ought to you have preboiled?
ought to they have preboiled? 	ought to I have been preboiling?
ought to you have been preboiling?
ought to she have been preboiling?
ought to we have been preboiling?
ought to you have been preboiling?
ought to they have been preboiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought I not to preboil?
ought you not to preboil?
ought she not to preboil?
ought we not to preboil?
ought you not to preboil?
ought they not to preboil? 	ought I not to be preboiling?
ought you not to be preboiling?
ought she not to be preboiling?
ought we not to be preboiling?
ought you not to be preboiling?
ought they not to be preboiling? 	ought I not to have preboiled?
ought you not to have preboiled?
ought she not to have preboiled?
ought we not to have preboiled?
ought you not to have preboiled?
ought they not to have preboiled? 	ought I not to have been preboiling?
ought you not to have been preboiling?
ought she not to have been preboiling?
ought we not to have been preboiling?
ought you not to have been preboiling?
ought they not to have been preboiling?