English verb conjugation
CAN RETRACE

Regular verb: retrace - retraced - retraced

Affirmation

Simple form	V-ing form
I can retrace you can retrace he can retrace we can retrace you can retrace they can retrace	I can be retracing you can be retracing he can be retracing we can be retracing you can be retracing they can be retracing
Perfect	V-ing perfect
I can have retraced you can have retraced he can have retraced we can have retraced you can have retraced they can have retraced	I can have been retracing you can have been retracing he can have been retracing we can have been retracing you can have been retracing they can have been retracing

Negation

Simple form	V-ing form
I can't retrace you can't retrace he can't retrace we can't retrace you can't retrace they can't retrace	I can't be retracing you can't be retracing he can't be retracing we can't be retracing you can't be retracing they can't be retracing
Perfect	V-ing perfect
I can't have retraced you can't have retraced he can't have retraced we can't have retraced you can't have retraced they can't have retraced	I can't have been retracing you can't have been retracing he 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	V-ing form
can I retrace? can you retrace? can he retrace? can we retrace? can you retrace? can they retrace?	can I be retracing? can you be retracing? can he be retracing? can we be retracing? can you be retracing? can they be retracing?
Perfect	V-ing perfect
can I have retraced? can you have retraced? can he have retraced? can we have retraced? can you have retraced? can they have retraced?	can I have been retracing? can you have been retracing? can he have been retracing? can we have been retracing? can you have been retracing? can they have been retracing?

Interro-negative form

Simple form	V-ing form
can't I retrace? can't you retrace? can't he retrace? can't we retrace? can't you retrace? can't they retrace?	can't I be retracing? can't you be retracing? can't he be retracing? can't we be retracing? can't you be retracing? can't they be retracing?
Perfect	V-ing perfect
can't I have retraced? can't you have retraced? can't he have retraced? can't we have retraced? can't you have retraced? can't they have retraced?	can't I have been retracing? can't you have been retracing? can't he have been retracing? can't we have been retracing? can't you have been retracing? can't they have been retracing?