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