English verb conjugation
CAN TRACE

Regular verb: trace - traced - traced

Affirmation

Simple form	V-ing form
I can trace you can trace he can trace we can trace you can trace they can trace	I can be tracing you can be tracing he can be tracing we can be tracing you can be tracing they can be tracing
Perfect	V-ing perfect
I can have traced you can have traced he can have traced we can have traced you can have traced they can have traced	I can have been tracing you can have been tracing he can have been tracing we can have been tracing you can have been tracing they can have been tracing

Negation

Simple form	V-ing form
I can't trace you can't trace he can't trace we can't trace you can't trace they can't trace	I can't be tracing you can't be tracing he can't be tracing we can't be tracing you can't be tracing they can't be tracing
Perfect	V-ing perfect
I can't have traced you can't have traced he can't have traced we can't have traced you can't have traced they can't have traced	I can't have been tracing you can't have been tracing he can't have been tracing we can't have been tracing you can't have been tracing they can't have been tracing

Interrogative form

Simple form	V-ing form
can I trace? can you trace? can he trace? can we trace? can you trace? can they trace?	can I be tracing? can you be tracing? can he be tracing? can we be tracing? can you be tracing? can they be tracing?
Perfect	V-ing perfect
can I have traced? can you have traced? can he have traced? can we have traced? can you have traced? can they have traced?	can I have been tracing? can you have been tracing? can he have been tracing? can we have been tracing? can you have been tracing? can they have been tracing?

Interro-negative form

Simple form	V-ing form
can't I trace? can't you trace? can't he trace? can't we trace? can't you trace? can't they trace?	can't I be tracing? can't you be tracing? can't he be tracing? can't we be tracing? can't you be tracing? can't they be tracing?
Perfect	V-ing perfect
can't I have traced? can't you have traced? can't he have traced? can't we have traced? can't you have traced? can't they have traced?	can't I have been tracing? can't you have been tracing? can't he have been tracing? can't we have been tracing? can't you have been tracing? can't they have been tracing?