could blush
Regular verb: blush - blushed- blushed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blush
you could blush
she could blush
we could blush
you could blush
they could blush 	I could be blushing
you could be blushing
she could be blushing
we could be blushing
you could be blushing
they could be blushing	I could have blushed
you could have blushed
she could have blushed
we could have blushed
you could have blushed
they could have blushed	I could have been blushing
you could have been blushing
she could have been blushing
we could have been blushing
you could have been blushing
they could have been blushing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't blush
you couldn't blush
she couldn't blush
we couldn't blush
you couldn't blush
they couldn't blush 	I couldn't be blushing
you couldn't be blushing
she couldn't be blushing
we couldn't be blushing
you couldn't be blushing
they couldn't be blushing	I couldn't have blushed
you couldn't have blushed
she couldn't have blushed
we couldn't have blushed
you couldn't have blushed
they couldn't have blushed	I couldn't have been blushing
you couldn't have been blushing
she couldn't have been blushing
we couldn't have been blushing
you couldn't have been blushing
they couldn't have been blushing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blush?
could you blush?
could she blush?
could we blush?
could you blush?
could they blush? 	could I be blushing?
could you be blushing?
could she be blushing?
could we be blushing?
could you be blushing?
could they be blushing? 	could I have blushed?
could you have blushed?
could she have blushed?
could we have blushed?
could you have blushed?
could they have blushed? 	could I have been blushing?
could you have been blushing?
could she have been blushing?
could we have been blushing?
could you have been blushing?
could they have been blushing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I blush?
couldn't you blush?
couldn't she blush?
couldn't we blush?
couldn't you blush?
couldn't they blush? 	couldn't I be blushing?
couldn't you be blushing?
couldn't she be blushing?
couldn't we be blushing?
couldn't you be blushing?
couldn't they be blushing? 	couldn't I have blushed?
couldn't you have blushed?
couldn't she have blushed?
couldn't we have blushed?
couldn't you have blushed?
couldn't they have blushed? 	couldn't I have been blushing?
couldn't you have been blushing?
couldn't she have been blushing?
couldn't we have been blushing?
couldn't you have been blushing?
couldn't they have been blushing?