I can trace you can trace he can trace we can trace you can trace they can trace
V-ing form
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
I can have traced you can have traced he can have traced we can have traced you can have traced they can have traced
V-ing perfect
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
I can't trace you can't trace he can't trace we can't trace you can't trace they can't trace
V-ing form
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
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
V-ing perfect
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
can I trace? can you trace? can he trace? can we trace? can you trace? can they trace?
V-ing form
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
can I have traced? can you have traced? can he have traced? can we have traced? can you have traced? can they have traced?
V-ing perfect
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
can't I trace? can't you trace? can't he trace? can't we trace? can't you trace? can't they trace?
V-ing form
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
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?
V-ing perfect
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?