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 ought not to preboil you ought not to preboil he 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 he ought not to preboiling we ought not to preboiling you ought not to preboiling they ought not to preboiling
Perfect	V-ing perfect
I ought not to have preboiled you ought not to have preboiled he 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 he 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
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
ought I not to preboil? ought you not to preboil? ought he 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 he not to be preboiling? ought we not to be preboiling? ought you not to be preboiling? ought they not to be preboiling?
Perfect	V-ing perfect
ought I not to have preboiled? ought you not to have preboiled? ought he 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 he 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?