English verb conjugation
CAN FLEX

Regular verb: flex - flexed - flexed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?