I can retrace you can retrace she can retrace we can retrace you can retrace they can retrace
V-ing form
I can be retracing you can be retracing she can be retracing we can be retracing you can be retracing they can be retracing
Perfect
I can have retraced you can have retraced she can have retraced we can have retraced you can have retraced they can have retraced
V-ing perfect
I can have been retracing you can have been retracing she can have been retracing we can have been retracing you can have been retracing they can have been retracing
Negation
Simple form
I can't retrace you can't retrace she can't retrace we can't retrace you can't retrace they can't retrace
V-ing form
I can't be retracing you can't be retracing she can't be retracing we can't be retracing you can't be retracing they can't be retracing
Perfect
I can't have retraced you can't have retraced she can't have retraced we can't have retraced you can't have retraced they can't have retraced
V-ing perfect
I can't have been retracing you can't have been retracing she can't have been retracing we can't have been retracing you can't have been retracing they can't have been retracing
Interrogative form
Simple form
can I retrace? can you retrace? can she retrace? can we retrace? can you retrace? can they retrace?
V-ing form
can I be retracing? can you be retracing? can she be retracing? can we be retracing? can you be retracing? can they be retracing?
Perfect
can I have retraced? can you have retraced? can she have retraced? can we have retraced? can you have retraced? can they have retraced?
V-ing perfect
can I have been retracing? can you have been retracing? can she have been retracing? can we have been retracing? can you have been retracing? can they have been retracing?
Interro-negative form
Simple form
can't I retrace? can't you retrace? can't she retrace? can't we retrace? can't you retrace? can't they retrace?
V-ing form
can't I be retracing? can't you be retracing? can't she be retracing? can't we be retracing? can't you be retracing? can't they be retracing?
Perfect
can't I have retraced? can't you have retraced? can't she have retraced? can't we have retraced? can't you have retraced? can't they have retraced?
V-ing perfect
can't I have been retracing? can't you have been retracing? can't she have been retracing? can't we have been retracing? can't you have been retracing? can't they have been retracing?