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