I can fluctuate you can fluctuate he can fluctuate we can fluctuate you can fluctuate they can fluctuate
V-ing form
I can be fluctuating you can be fluctuating he can be fluctuating we can be fluctuating you can be fluctuating they can be fluctuating
Perfect
I can have fluctuated you can have fluctuated he can have fluctuated we can have fluctuated you can have fluctuated they can have fluctuated
V-ing perfect
I can have been fluctuating you can have been fluctuating he can have been fluctuating we can have been fluctuating you can have been fluctuating they can have been fluctuating
Negation
Simple form
I cannot fluctuate you cannot fluctuate he cannot fluctuate we cannot fluctuate you cannot fluctuate they cannot fluctuate
V-ing form
I cannot be fluctuating you cannot be fluctuating he cannot be fluctuating we cannot be fluctuating you cannot be fluctuating they cannot be fluctuating
Perfect
I cannot have fluctuated you cannot have fluctuated he cannot have fluctuated we cannot have fluctuated you cannot have fluctuated they cannot have fluctuated
V-ing perfect
I cannot have been fluctuating you cannot have been fluctuating he cannot have been fluctuating we cannot have been fluctuating you cannot have been fluctuating they cannot have been fluctuating
Interrogative form
Simple form
can I fluctuate? can you fluctuate? can he fluctuate? can we fluctuate? can you fluctuate? can they fluctuate?
V-ing form
can I be fluctuating? can you be fluctuating? can he be fluctuating? can we be fluctuating? can you be fluctuating? can they be fluctuating?
Perfect
can I have fluctuated? can you have fluctuated? can he have fluctuated? can we have fluctuated? can you have fluctuated? can they have fluctuated?
V-ing perfect
can I have been fluctuating? can you have been fluctuating? can he have been fluctuating? can we have been fluctuating? can you have been fluctuating? can they have been fluctuating?
Interro-negative form
Simple form
can I not fluctuate? can you not fluctuate? can he not fluctuate? can we not fluctuate? can you not fluctuate? can they not fluctuate?
V-ing form
can I not be fluctuating? can you not be fluctuating? can he not be fluctuating? can we not be fluctuating? can you not be fluctuating? can they not be fluctuating?
Perfect
can I not have fluctuated? can you not have fluctuated? can he not have fluctuated? can we not have fluctuated? can you not have fluctuated? can they not have fluctuated?
V-ing perfect
can I not have been fluctuating? can you not have been fluctuating? can he not have been fluctuating? can we not have been fluctuating? can you not have been fluctuating? can they not have been fluctuating?