I could trace you could trace he could trace we could trace you could trace they could trace
Forma com V-ing
I could be tracing you could be tracing he could be tracing we could be tracing you could be tracing they could be tracing
Perfeito
I could have traced you could have traced he could have traced we could have traced you could have traced they could have traced
Perfeito com V-ing
I could have been tracing you could have been tracing he could have been tracing we could have been tracing you could have been tracing they could have been tracing
Negação
Forma simple
I couldn't trace you couldn't trace he couldn't trace we couldn't trace you couldn't trace they couldn't trace
Forma com V-ing
I couldn't be tracing you couldn't be tracing he couldn't be tracing we couldn't be tracing you couldn't be tracing they couldn't be tracing
Perfeito
I couldn't have traced you couldn't have traced he couldn't have traced we couldn't have traced you couldn't have traced they couldn't have traced
Perfeito com V-ing
I couldn't have been tracing you couldn't have been tracing he couldn't have been tracing we couldn't have been tracing you couldn't have been tracing they couldn't have been tracing
Forma interrogativa
Forma simple
could I trace? could you trace? could he trace? could we trace? could you trace? could they trace?
Forma com V-ing
could I be tracing? could you be tracing? could he be tracing? could we be tracing? could you be tracing? could they be tracing?
Perfeito
could I have traced? could you have traced? could he have traced? could we have traced? could you have traced? could they have traced?
Perfeito com V-ing
could I have been tracing? could you have been tracing? could he have been tracing? could we have been tracing? could you have been tracing? could they have been tracing?
Forma interro-Negação
Forma simple
couldn't I trace? couldn't you trace? couldn't he trace? couldn't we trace? couldn't you trace? couldn't they trace?
Forma com V-ing
couldn't I be tracing? couldn't you be tracing? couldn't he be tracing? couldn't we be tracing? couldn't you be tracing? couldn't they be tracing?
Perfeito
couldn't I have traced? couldn't you have traced? couldn't he have traced? couldn't we have traced? couldn't you have traced? couldn't they have traced?
Perfeito com V-ing
couldn't I have been tracing? couldn't you have been tracing? couldn't he have been tracing? couldn't we have been tracing? couldn't you have been tracing? couldn't they have been tracing?