I can fertilize you can fertilize he can fertilize we can fertilize you can fertilize they can fertilize
V-ing form
I can be fertilizing you can be fertilizing he can be fertilizing we can be fertilizing you can be fertilizing they can be fertilizing
Perfect
I can have fertilized you can have fertilized he can have fertilized we can have fertilized you can have fertilized they can have fertilized
V-ing perfect
I can have been fertilizing you can have been fertilizing he can have been fertilizing we can have been fertilizing you can have been fertilizing they can have been fertilizing
Negation
Simple form
I cannot fertilize you cannot fertilize he cannot fertilize we cannot fertilize you cannot fertilize they cannot fertilize
V-ing form
I cannot be fertilizing you cannot be fertilizing he cannot be fertilizing we cannot be fertilizing you cannot be fertilizing they cannot be fertilizing
Perfect
I cannot have fertilized you cannot have fertilized he cannot have fertilized we cannot have fertilized you cannot have fertilized they cannot have fertilized
V-ing perfect
I cannot have been fertilizing you cannot have been fertilizing he cannot have been fertilizing we cannot have been fertilizing you cannot have been fertilizing they cannot have been fertilizing
Interrogative form
Simple form
can I fertilize? can you fertilize? can he fertilize? can we fertilize? can you fertilize? can they fertilize?
V-ing form
can I be fertilizing? can you be fertilizing? can he be fertilizing? can we be fertilizing? can you be fertilizing? can they be fertilizing?
Perfect
can I have fertilized? can you have fertilized? can he have fertilized? can we have fertilized? can you have fertilized? can they have fertilized?
V-ing perfect
can I have been fertilizing? can you have been fertilizing? can he have been fertilizing? can we have been fertilizing? can you have been fertilizing? can they have been fertilizing?
Interro-negative form
Simple form
can I not fertilize? can you not fertilize? can he not fertilize? can we not fertilize? can you not fertilize? can they not fertilize?
V-ing form
can I not be fertilizing? can you not be fertilizing? can he not be fertilizing? can we not be fertilizing? can you not be fertilizing? can they not be fertilizing?
Perfect
can I not have fertilized? can you not have fertilized? can he not have fertilized? can we not have fertilized? can you not have fertilized? can they not have fertilized?
V-ing perfect
can I not have been fertilizing? can you not have been fertilizing? can he not have been fertilizing? can we not have been fertilizing? can you not have been fertilizing? can they not have been fertilizing?