English verb conjugation
OUGHT TO CLUSTER

Regular verb: cluster - clustered - clustered

Affirmation

Simple form	V-ing form
I ought to cluster you ought to cluster he ought to cluster we ought to cluster you ought to cluster they ought to cluster	I ought to be clustering you ought to be clustering he ought to be clustering we ought to be clustering you ought to be clustering they ought to be clustering
Perfect	V-ing perfect
I ought to have clustered you ought to have clustered he ought to have clustered we ought to have clustered you ought to have clustered they ought to have clustered	I ought to have been clustering you ought to have been clustering he ought to have been clustering we ought to have been clustering you ought to have been clustering they ought to have been clustering

Negation

Simple form	V-ing form
I oughtn't to cluster you oughtn't to cluster he oughtn't to cluster we oughtn't to cluster you oughtn't to cluster they oughtn't to cluster	I oughtn't to be clustering you oughtn't to be clustering he oughtn't to be clustering we oughtn't to be clustering you oughtn't to be clustering they oughtn't to be clustering
Perfect	V-ing perfect
I oughtn't to have clustered you oughtn't to have clustered he oughtn't to have clustered we oughtn't to have clustered you oughtn't to have clustered they oughtn't to have clustered	I oughtn't to have been clustering you oughtn't to have been clustering he oughtn't to have been clustering we oughtn't to have been clustering you oughtn't to have been clustering they oughtn't to have been clustering

Interrogative form

Simple form	V-ing form
ought to I cluster? ought to you cluster? ought to he cluster? ought to we cluster? ought to you cluster? ought to they cluster?	ought to I be clustering? ought to you be clustering? ought to he be clustering? ought to we be clustering? ought to you be clustering? ought to they be clustering?
Perfect	V-ing perfect
ought to I have clustered? ought to you have clustered? ought to he have clustered? ought to we have clustered? ought to you have clustered? ought to they have clustered?	ought to I have been clustering? ought to you have been clustering? ought to he have been clustering? ought to we have been clustering? ought to you have been clustering? ought to they have been clustering?

Interro-negative form

Simple form	V-ing form
oughtn't I to cluster? oughtn't you to cluster? oughtn't he to cluster? oughtn't we to cluster? oughtn't you to cluster? oughtn't they to cluster?	oughtn't I to be clustering? oughtn't you to be clustering? oughtn't he to be clustering? oughtn't we to be clustering? oughtn't you to be clustering? oughtn't they to be clustering?
Perfect	V-ing perfect
oughtn't I to have clustered? oughtn't you to have clustered? oughtn't he to have clustered? oughtn't we to have clustered? oughtn't you to have clustered? oughtn't they to have clustered?	oughtn't I to have been clustering? oughtn't you to have been clustering? oughtn't he to have been clustering? oughtn't we to have been clustering? oughtn't you to have been clustering? oughtn't they to have been clustering?