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 cannot obscure you cannot obscure she cannot obscure we cannot obscure you cannot obscure they cannot obscure
V-ing form
I cannot be obscuring you cannot be obscuring she cannot be obscuring we cannot be obscuring you cannot be obscuring they cannot be obscuring
Perfect
I cannot have obscured you cannot have obscured she cannot have obscured we cannot have obscured you cannot have obscured they cannot have obscured
V-ing perfect
I cannot have been obscuring you cannot have been obscuring she cannot have been obscuring we cannot have been obscuring you cannot have been obscuring they cannot 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 I not obscure? can you not obscure? can she not obscure? can we not obscure? can you not obscure? can they not obscure?
V-ing form
can I not be obscuring? can you not be obscuring? can she not be obscuring? can we not be obscuring? can you not be obscuring? can they not be obscuring?
Perfect
can I not have obscured? can you not have obscured? can she not have obscured? can we not have obscured? can you not have obscured? can they not have obscured?
V-ing perfect
can I not have been obscuring? can you not have been obscuring? can she not have been obscuring? can we not have been obscuring? can you not have been obscuring? can they not have been obscuring?