I could localize you could localize he could localize we could localize you could localize they could localize
V-ing form
I could be localizing you could be localizing he could be localizing we could be localizing you could be localizing they could be localizing
Perfect
I could have localized you could have localized he could have localized we could have localized you could have localized they could have localized
V-ing perfect
I could have been localizing you could have been localizing he could have been localizing we could have been localizing you could have been localizing they could have been localizing
Negation
Simple form
I could not localize you could not localize he could not localize we could not localize you could not localize they could not localize
V-ing form
I could not be localizing you could not be localizing he could not be localizing we could not be localizing you could not be localizing they could not be localizing
Perfect
I could not have localized you could not have localized he could not have localized we could not have localized you could not have localized they could not have localized
V-ing perfect
I could not have been localizing you could not have been localizing he could not have been localizing we could not have been localizing you could not have been localizing they could not have been localizing
Interrogative form
Simple form
could I localize? could you localize? could he localize? could we localize? could you localize? could they localize?
V-ing form
could I be localizing? could you be localizing? could he be localizing? could we be localizing? could you be localizing? could they be localizing?
Perfect
could I have localized? could you have localized? could he have localized? could we have localized? could you have localized? could they have localized?
V-ing perfect
could I have been localizing? could you have been localizing? could he have been localizing? could we have been localizing? could you have been localizing? could they have been localizing?
Interro-negative form
Simple form
could I not localize? could you not localize? could he not localize? could we not localize? could you not localize? could they not localize?
V-ing form
could I not be localizing? could you not be localizing? could he not be localizing? could we not be localizing? could you not be localizing? could they not be localizing?
Perfect
could I not have localized? could you not have localized? could he not have localized? could we not have localized? could you not have localized? could they not have localized?
V-ing perfect
could I not have been localizing? could you not have been localizing? could he not have been localizing? could we not have been localizing? could you not have been localizing? could they not have been localizing?