I can restraighten you can restraighten he can restraighten we can restraighten you can restraighten they can restraighten
V-ing form
I can be restraightening you can be restraightening he can be restraightening we can be restraightening you can be restraightening they can be restraightening
Perfect
I can have restraightened you can have restraightened he can have restraightened we can have restraightened you can have restraightened they can have restraightened
V-ing perfect
I can have been restraightening you can have been restraightening he can have been restraightening we can have been restraightening you can have been restraightening they can have been restraightening
Negation
Simple form
I cannot restraighten you cannot restraighten he cannot restraighten we cannot restraighten you cannot restraighten they cannot restraighten
V-ing form
I cannot be restraightening you cannot be restraightening he cannot be restraightening we cannot be restraightening you cannot be restraightening they cannot be restraightening
Perfect
I cannot have restraightened you cannot have restraightened he cannot have restraightened we cannot have restraightened you cannot have restraightened they cannot have restraightened
V-ing perfect
I cannot have been restraightening you cannot have been restraightening he cannot have been restraightening we cannot have been restraightening you cannot have been restraightening they cannot have been restraightening
Interrogative form
Simple form
can I restraighten? can you restraighten? can he restraighten? can we restraighten? can you restraighten? can they restraighten?
V-ing form
can I be restraightening? can you be restraightening? can he be restraightening? can we be restraightening? can you be restraightening? can they be restraightening?
Perfect
can I have restraightened? can you have restraightened? can he have restraightened? can we have restraightened? can you have restraightened? can they have restraightened?
V-ing perfect
can I have been restraightening? can you have been restraightening? can he have been restraightening? can we have been restraightening? can you have been restraightening? can they have been restraightening?
Interro-negative form
Simple form
can I not restraighten? can you not restraighten? can he not restraighten? can we not restraighten? can you not restraighten? can they not restraighten?
V-ing form
can I not be restraightening? can you not be restraightening? can he not be restraightening? can we not be restraightening? can you not be restraightening? can they not be restraightening?
Perfect
can I not have restraightened? can you not have restraightened? can he not have restraightened? can we not have restraightened? can you not have restraightened? can they not have restraightened?
V-ing perfect
can I not have been restraightening? can you not have been restraightening? can he not have been restraightening? can we not have been restraightening? can you not have been restraightening? can they not have been restraightening?