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