I can obscure you can obscure she can obscure we can obscure you can obscure they can obscure
V-ing form
I can be obscuring you can be obscuring she can be obscuring we can be obscuring you can be obscuring they can be obscuring
Perfect
I can have obscured you can have obscured she 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 she 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 she 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 she 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 she 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 she 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 she obscure? can we obscure? can you obscure? can they obscure?
V-ing form
can I be obscuring? can you be obscuring? can she be obscuring? can we be obscuring? can you be obscuring? can they be obscuring?
Perfect
can I have obscured? can you have obscured? can she 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 she 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 she 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 she 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 she 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 she have been obscuring? can't we have been obscuring? can't you have been obscuring? can't they have been obscuring?