can flex
Regular verb: flex - flexed- flexed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can flex
you can flex
he can flex
we can flex
you can flex
they can flex 	I can be flexing
you can be flexing
he can be flexing
we can be flexing
you can be flexing
they can be flexing	I can have flexed
you can have flexed
he can have flexed
we can have flexed
you can have flexed
they can have flexed	I can have been flexing
you can have been flexing
he can have been flexing
we can have been flexing
you can have been flexing
they can have been flexing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't flex
you can't flex
he can't flex
we can't flex
you can't flex
they can't flex 	I can't be flexing
you can't be flexing
he can't be flexing
we can't be flexing
you can't be flexing
they can't be flexing	I can't have flexed
you can't have flexed
he can't have flexed
we can't have flexed
you can't have flexed
they can't have flexed	I can't have been flexing
you can't have been flexing
he can't have been flexing
we can't have been flexing
you can't have been flexing
they can't have been flexing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I flex?
can you flex?
can he flex?
can we flex?
can you flex?
can they flex? 	can I be flexing?
can you be flexing?
can he be flexing?
can we be flexing?
can you be flexing?
can they be flexing? 	can I have flexed?
can you have flexed?
can he have flexed?
can we have flexed?
can you have flexed?
can they have flexed? 	can I have been flexing?
can you have been flexing?
can he have been flexing?
can we have been flexing?
can you have been flexing?
can they have been flexing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I flex?
can't you flex?
can't he flex?
can't we flex?
can't you flex?
can't they flex? 	can't I be flexing?
can't you be flexing?
can't he be flexing?
can't we be flexing?
can't you be flexing?
can't they be flexing? 	can't I have flexed?
can't you have flexed?
can't he have flexed?
can't we have flexed?
can't you have flexed?
can't they have flexed? 	can't I have been flexing?
can't you have been flexing?
can't he have been flexing?
can't we have been flexing?
can't you have been flexing?
can't they have been flexing?