I can aviate you can aviate he can aviate we can aviate you can aviate they can aviate
V-ing form
I can be aviating you can be aviating he can be aviating we can be aviating you can be aviating they can be aviating
Perfect
I can have aviated you can have aviated he can have aviated we can have aviated you can have aviated they can have aviated
V-ing perfect
I can have been aviating you can have been aviating he can have been aviating we can have been aviating you can have been aviating they can have been aviating
Negation
Simple form
I can't aviate you can't aviate he can't aviate we can't aviate you can't aviate they can't aviate
V-ing form
I can't be aviating you can't be aviating he can't be aviating we can't be aviating you can't be aviating they can't be aviating
Perfect
I can't have aviated you can't have aviated he can't have aviated we can't have aviated you can't have aviated they can't have aviated
V-ing perfect
I can't have been aviating you can't have been aviating he can't have been aviating we can't have been aviating you can't have been aviating they can't have been aviating
Interrogative form
Simple form
can I aviate? can you aviate? can he aviate? can we aviate? can you aviate? can they aviate?
V-ing form
can I be aviating? can you be aviating? can he be aviating? can we be aviating? can you be aviating? can they be aviating?
Perfect
can I have aviated? can you have aviated? can he have aviated? can we have aviated? can you have aviated? can they have aviated?
V-ing perfect
can I have been aviating? can you have been aviating? can he have been aviating? can we have been aviating? can you have been aviating? can they have been aviating?
Interro-negative form
Simple form
can't I aviate? can't you aviate? can't he aviate? can't we aviate? can't you aviate? can't they aviate?
V-ing form
can't I be aviating? can't you be aviating? can't he be aviating? can't we be aviating? can't you be aviating? can't they be aviating?
Perfect
can't I have aviated? can't you have aviated? can't he have aviated? can't we have aviated? can't you have aviated? can't they have aviated?
V-ing perfect
can't I have been aviating? can't you have been aviating? can't he have been aviating? can't we have been aviating? can't you have been aviating? can't they have been aviating?