I can greaten you can greaten she can greaten we can greaten you can greaten they can greaten
V-ing form
I can be greatening you can be greatening she can be greatening we can be greatening you can be greatening they can be greatening
Perfect
I can have greatened you can have greatened she can have greatened we can have greatened you can have greatened they can have greatened
V-ing perfect
I can have been greatening you can have been greatening she can have been greatening we can have been greatening you can have been greatening they can have been greatening
Negation
Simple form
I cannot greaten you cannot greaten she cannot greaten we cannot greaten you cannot greaten they cannot greaten
V-ing form
I cannot be greatening you cannot be greatening she cannot be greatening we cannot be greatening you cannot be greatening they cannot be greatening
Perfect
I cannot have greatened you cannot have greatened she cannot have greatened we cannot have greatened you cannot have greatened they cannot have greatened
V-ing perfect
I cannot have been greatening you cannot have been greatening she cannot have been greatening we cannot have been greatening you cannot have been greatening they cannot have been greatening
Interrogative form
Simple form
can I greaten? can you greaten? can she greaten? can we greaten? can you greaten? can they greaten?
V-ing form
can I be greatening? can you be greatening? can she be greatening? can we be greatening? can you be greatening? can they be greatening?
Perfect
can I have greatened? can you have greatened? can she have greatened? can we have greatened? can you have greatened? can they have greatened?
V-ing perfect
can I have been greatening? can you have been greatening? can she have been greatening? can we have been greatening? can you have been greatening? can they have been greatening?
Interro-negative form
Simple form
can I not greaten? can you not greaten? can she not greaten? can we not greaten? can you not greaten? can they not greaten?
V-ing form
can I not be greatening? can you not be greatening? can she not be greatening? can we not be greatening? can you not be greatening? can they not be greatening?
Perfect
can I not have greatened? can you not have greatened? can she not have greatened? can we not have greatened? can you not have greatened? can they not have greatened?
V-ing perfect
can I not have been greatening? can you not have been greatening? can she not have been greatening? can we not have been greatening? can you not have been greatening? can they not have been greatening?