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 can't fluctuate you can't fluctuate he can't fluctuate we can't fluctuate you can't fluctuate they can't fluctuate
V-ing form
I can't be fluctuating you can't be fluctuating he can't be fluctuating we can't be fluctuating you can't be fluctuating they can't be fluctuating
Perfect
I can't have fluctuated you can't have fluctuated he can't have fluctuated we can't have fluctuated you can't have fluctuated they can't have fluctuated
V-ing perfect
I can't have been fluctuating you can't have been fluctuating he can't have been fluctuating we can't have been fluctuating you can't have been fluctuating they can't 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't I fluctuate? can't you fluctuate? can't he fluctuate? can't we fluctuate? can't you fluctuate? can't they fluctuate?
V-ing form
can't I be fluctuating? can't you be fluctuating? can't he be fluctuating? can't we be fluctuating? can't you be fluctuating? can't they be fluctuating?
Perfect
can't I have fluctuated? can't you have fluctuated? can't he have fluctuated? can't we have fluctuated? can't you have fluctuated? can't they have fluctuated?
V-ing perfect
can't I have been fluctuating? can't you have been fluctuating? can't he have been fluctuating? can't we have been fluctuating? can't you have been fluctuating? can't they have been fluctuating?