English verb conjugation
CAN TRACE

Regular verb: trace - traced - traced

Affirmation

Simple form	V-ing form
I can trace you can trace she can trace we can trace you can trace they can trace	I can be tracing you can be tracing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she trace? can we trace? can you trace? can they trace?	can I be tracing? can you be tracing? can she 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 she 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 she 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 she 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 she 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 she 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 she have been tracing? can't we have been tracing? can't you have been tracing? can't they have been tracing?