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