English verb conjugation
OUGHT TO PREBOIL

Regular verb: preboil - preboiled - preboiled

Affirmation

Simple form	V-ing form
I ought to preboil you ought to preboil he 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 he ought to be preboiling we ought to be preboiling you ought to be preboiling they ought to be preboiling
Perfect	V-ing perfect
I ought to have preboiled you ought to have preboiled he 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 he 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
I oughtn't to preboil you oughtn't to preboil he oughtn't to preboil we oughtn't to preboil you oughtn't to preboil they oughtn't to preboil	I oughtn't to be preboiling you oughtn't to be preboiling he oughtn't to be preboiling we oughtn't to be preboiling you oughtn't to be preboiling they oughtn't to be preboiling
Perfect	V-ing perfect
I oughtn't to have preboiled you oughtn't to have preboiled he oughtn't to have preboiled we oughtn't to have preboiled you oughtn't to have preboiled they oughtn't to have preboiled	I oughtn't to have been preboiling you oughtn't to have been preboiling he oughtn't to have been preboiling we oughtn't to have been preboiling you oughtn't to have been preboiling they oughtn't to have been preboiling

Interrogative form

Simple form	V-ing form
ought to I preboil? ought to you preboil? ought to he 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 he be preboiling? ought to we be preboiling? ought to you be preboiling? ought to they be preboiling?
Perfect	V-ing perfect
ought to I have preboiled? ought to you have preboiled? ought to he 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 he 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
oughtn't I to preboil? oughtn't you to preboil? oughtn't he to preboil? oughtn't we to preboil? oughtn't you to preboil? oughtn't they to preboil?	oughtn't I to be preboiling? oughtn't you to be preboiling? oughtn't he to be preboiling? oughtn't we to be preboiling? oughtn't you to be preboiling? oughtn't they to be preboiling?
Perfect	V-ing perfect
oughtn't I to have preboiled? oughtn't you to have preboiled? oughtn't he to have preboiled? oughtn't we to have preboiled? oughtn't you to have preboiled? oughtn't they to have preboiled?	oughtn't I to have been preboiling? oughtn't you to have been preboiling? oughtn't he to have been preboiling? oughtn't we to have been preboiling? oughtn't you to have been preboiling? oughtn't they to have been preboiling?