I can describe you can describe he can describe we can describe you can describe they can describe
V-ing form
I can be describing you can be describing he can be describing we can be describing you can be describing they can be describing
Perfect
I can have described you can have described he can have described we can have described you can have described they can have described
V-ing perfect
I can have been describing you can have been describing he can have been describing we can have been describing you can have been describing they can have been describing
Negation
Simple form
I can't describe you can't describe he can't describe we can't describe you can't describe they can't describe
V-ing form
I can't be describing you can't be describing he can't be describing we can't be describing you can't be describing they can't be describing
Perfect
I can't have described you can't have described he can't have described we can't have described you can't have described they can't have described
V-ing perfect
I can't have been describing you can't have been describing he can't have been describing we can't have been describing you can't have been describing they can't have been describing
Interrogative form
Simple form
can I describe? can you describe? can he describe? can we describe? can you describe? can they describe?
V-ing form
can I be describing? can you be describing? can he be describing? can we be describing? can you be describing? can they be describing?
Perfect
can I have described? can you have described? can he have described? can we have described? can you have described? can they have described?
V-ing perfect
can I have been describing? can you have been describing? can he have been describing? can we have been describing? can you have been describing? can they have been describing?
Interro-negative form
Simple form
can't I describe? can't you describe? can't he describe? can't we describe? can't you describe? can't they describe?
V-ing form
can't I be describing? can't you be describing? can't he be describing? can't we be describing? can't you be describing? can't they be describing?
Perfect
can't I have described? can't you have described? can't he have described? can't we have described? can't you have described? can't they have described?
V-ing perfect
can't I have been describing? can't you have been describing? can't he have been describing? can't we have been describing? can't you have been describing? can't they have been describing?