English verb conjugation
OUGHT TO GRUB

Regular verb: grub - grubbed - grubbed

Affirmation

Simple form	V-ing form
I ought to grub you ought to grub she ought to grub we ought to grub you ought to grub they ought to grub	I ought to be grubbing you ought to be grubbing she ought to be grubbing we ought to be grubbing you ought to be grubbing they ought to be grubbing
Perfect	V-ing perfect
I ought to have grubbed you ought to have grubbed she ought to have grubbed we ought to have grubbed you ought to have grubbed they ought to have grubbed	I ought to have been grubbing you ought to have been grubbing she ought to have been grubbing we ought to have been grubbing you ought to have been grubbing they ought to have been grubbing

Negation

Simple form	V-ing form
I ought not to grub you ought not to grub she ought not to grub we ought not to grub you ought not to grub they ought not to grub	I ought not to grubbing you ought not to grubbing she ought not to grubbing we ought not to grubbing you ought not to grubbing they ought not to grubbing
Perfect	V-ing perfect
I ought not to have grubbed you ought not to have grubbed she ought not to have grubbed we ought not to have grubbed you ought not to have grubbed they ought not to have grubbed	I ought not to have been grubbing you ought not to have been grubbing she ought not to have been grubbing we ought not to have been grubbing you ought not to have been grubbing they ought not to have been grubbing

Interrogative form

Simple form	V-ing form
ought to I grub? ought to you grub? ought to she grub? ought to we grub? ought to you grub? ought to they grub?	ought to I be grubbing? ought to you be grubbing? ought to she be grubbing? ought to we be grubbing? ought to you be grubbing? ought to they be grubbing?
Perfect	V-ing perfect
ought to I have grubbed? ought to you have grubbed? ought to she have grubbed? ought to we have grubbed? ought to you have grubbed? ought to they have grubbed?	ought to I have been grubbing? ought to you have been grubbing? ought to she have been grubbing? ought to we have been grubbing? ought to you have been grubbing? ought to they have been grubbing?

Interro-negative form

Simple form	V-ing form
ought I not to grub? ought you not to grub? ought she not to grub? ought we not to grub? ought you not to grub? ought they not to grub?	ought I not to be grubbing? ought you not to be grubbing? ought she not to be grubbing? ought we not to be grubbing? ought you not to be grubbing? ought they not to be grubbing?
Perfect	V-ing perfect
ought I not to have grubbed? ought you not to have grubbed? ought she not to have grubbed? ought we not to have grubbed? ought you not to have grubbed? ought they not to have grubbed?	ought I not to have been grubbing? ought you not to have been grubbing? ought she not to have been grubbing? ought we not to have been grubbing? ought you not to have been grubbing? ought they not to have been grubbing?