I can blush you can blush he can blush we can blush you can blush they can blush
V-ing form
I can be blushing you can be blushing he can be blushing we can be blushing you can be blushing they can be blushing
Perfect
I can have blushed you can have blushed he can have blushed we can have blushed you can have blushed they can have blushed
V-ing perfect
I can have been blushing you can have been blushing he can have been blushing we can have been blushing you can have been blushing they can have been blushing
Negation
Simple form
I can't blush you can't blush he can't blush we can't blush you can't blush they can't blush
V-ing form
I can't be blushing you can't be blushing he can't be blushing we can't be blushing you can't be blushing they can't be blushing
Perfect
I can't have blushed you can't have blushed he can't have blushed we can't have blushed you can't have blushed they can't have blushed
V-ing perfect
I can't have been blushing you can't have been blushing he can't have been blushing we can't have been blushing you can't have been blushing they can't have been blushing
Interrogative form
Simple form
can I blush? can you blush? can he blush? can we blush? can you blush? can they blush?
V-ing form
can I be blushing? can you be blushing? can he be blushing? can we be blushing? can you be blushing? can they be blushing?
Perfect
can I have blushed? can you have blushed? can he have blushed? can we have blushed? can you have blushed? can they have blushed?
V-ing perfect
can I have been blushing? can you have been blushing? can he have been blushing? can we have been blushing? can you have been blushing? can they have been blushing?
Interro-negative form
Simple form
can't I blush? can't you blush? can't he blush? can't we blush? can't you blush? can't they blush?
V-ing form
can't I be blushing? can't you be blushing? can't he be blushing? can't we be blushing? can't you be blushing? can't they be blushing?
Perfect
can't I have blushed? can't you have blushed? can't he have blushed? can't we have blushed? can't you have blushed? can't they have blushed?
V-ing perfect
can't I have been blushing? can't you have been blushing? can't he have been blushing? can't we have been blushing? can't you have been blushing? can't they have been blushing?