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 can't cluster you can't cluster he can't cluster we can't cluster you can't cluster they can't cluster	I can't be clustering you can't be clustering he can't be clustering we can't be clustering you can't be clustering they can't be clustering
Perfect	V-ing perfect
I can't have clustered you can't have clustered he can't have clustered we can't have clustered you can't have clustered they can't have clustered	I can't have been clustering you can't have been clustering he can't have been clustering we can't have been clustering you can't have been clustering they can't 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't I cluster? can't you cluster? can't he cluster? can't we cluster? can't you cluster? can't they cluster?	can't I be clustering? can't you be clustering? can't he be clustering? can't we be clustering? can't you be clustering? can't they be clustering?
Perfect	V-ing perfect
can't I have clustered? can't you have clustered? can't he have clustered? can't we have clustered? can't you have clustered? can't they have clustered?	can't I have been clustering? can't you have been clustering? can't he have been clustering? can't we have been clustering? can't you have been clustering? can't they have been clustering?