English verb conjugation
CAN STRAIGHTEN

Regular verb: straighten - straightened - straightened

Affirmation

Simple form	V-ing form
I can straighten you can straighten he can straighten we can straighten you can straighten they can straighten	I can be straightening you can be straightening he can be straightening we can be straightening you can be straightening they can be straightening
Perfect	V-ing perfect
I can have straightened you can have straightened he can have straightened we can have straightened you can have straightened they can have straightened	I can have been straightening you can have been straightening he can have been straightening we can have been straightening you can have been straightening they can have been straightening

Negation

Simple form	V-ing form
I can't straighten you can't straighten he can't straighten we can't straighten you can't straighten they can't straighten	I can't be straightening you can't be straightening he can't be straightening we can't be straightening you can't be straightening they can't be straightening
Perfect	V-ing perfect
I can't have straightened you can't have straightened he can't have straightened we can't have straightened you can't have straightened they can't have straightened	I can't have been straightening you can't have been straightening he can't have been straightening we can't have been straightening you can't have been straightening they can't have been straightening

Interrogative form

Simple form	V-ing form
can I straighten? can you straighten? can he straighten? can we straighten? can you straighten? can they straighten?	can I be straightening? can you be straightening? can he be straightening? can we be straightening? can you be straightening? can they be straightening?
Perfect	V-ing perfect
can I have straightened? can you have straightened? can he have straightened? can we have straightened? can you have straightened? can they have straightened?	can I have been straightening? can you have been straightening? can he have been straightening? can we have been straightening? can you have been straightening? can they have been straightening?

Interro-negative form

Simple form	V-ing form
can't I straighten? can't you straighten? can't he straighten? can't we straighten? can't you straighten? can't they straighten?	can't I be straightening? can't you be straightening? can't he be straightening? can't we be straightening? can't you be straightening? can't they be straightening?
Perfect	V-ing perfect
can't I have straightened? can't you have straightened? can't he have straightened? can't we have straightened? can't you have straightened? can't they have straightened?	can't I have been straightening? can't you have been straightening? can't he have been straightening? can't we have been straightening? can't you have been straightening? can't they have been straightening?