English verb conjugation
CAN CLUSTER

Regular verb: cluster - clustered - clustered

Affirmation

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

Negation

Simple form	V-ing form
I cannot cluster you cannot cluster he cannot cluster we cannot cluster you cannot cluster they cannot cluster	I cannot be clustering you cannot be clustering he cannot be clustering we cannot be clustering you cannot be clustering they cannot be clustering
Perfect	V-ing perfect
I cannot have clustered you cannot have clustered he cannot have clustered we cannot have clustered you cannot have clustered they cannot have clustered	I cannot have been clustering you cannot have been clustering he cannot have been clustering we cannot have been clustering you cannot have been clustering they cannot have been clustering

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not cluster? can you not cluster? can he not cluster? can we not cluster? can you not cluster? can they not cluster?	can I not be clustering? can you not be clustering? can he not be clustering? can we not be clustering? can you not be clustering? can they not be clustering?
Perfect	V-ing perfect
can I not have clustered? can you not have clustered? can he not have clustered? can we not have clustered? can you not have clustered? can they not have clustered?	can I not have been clustering? can you not have been clustering? can he not have been clustering? can we not have been clustering? can you not have been clustering? can they not have been clustering?