I can witness you can witness he can witness we can witness you can witness they can witness
Forma con V-ing
I can be witnessing you can be witnessing he can be witnessing we can be witnessing you can be witnessing they can be witnessing
Perfecto
I can have witnessed you can have witnessed he can have witnessed we can have witnessed you can have witnessed they can have witnessed
Perfecto con V-ing
I can have been witnessing you can have been witnessing he can have been witnessing we can have been witnessing you can have been witnessing they can have been witnessing
Negación
Forma simple
I cannot witness you cannot witness he cannot witness we cannot witness you cannot witness they cannot witness
Forma con V-ing
I cannot be witnessing you cannot be witnessing he cannot be witnessing we cannot be witnessing you cannot be witnessing they cannot be witnessing
Perfecto
I cannot have witnessed you cannot have witnessed he cannot have witnessed we cannot have witnessed you cannot have witnessed they cannot have witnessed
Perfecto con V-ing
I cannot have been witnessing you cannot have been witnessing he cannot have been witnessing we cannot have been witnessing you cannot have been witnessing they cannot have been witnessing
Forma interrogativa
Forma simple
can I witness? can you witness? can he witness? can we witness? can you witness? can they witness?
Forma con V-ing
can I be witnessing? can you be witnessing? can he be witnessing? can we be witnessing? can you be witnessing? can they be witnessing?
Perfecto
can I have witnessed? can you have witnessed? can he have witnessed? can we have witnessed? can you have witnessed? can they have witnessed?
Perfecto con V-ing
can I have been witnessing? can you have been witnessing? can he have been witnessing? can we have been witnessing? can you have been witnessing? can they have been witnessing?
Forma interro-negativa
Forma simple
can I not witness? can you not witness? can he not witness? can we not witness? can you not witness? can they not witness?
Forma con V-ing
can I not be witnessing? can you not be witnessing? can he not be witnessing? can we not be witnessing? can you not be witnessing? can they not be witnessing?
Perfecto
can I not have witnessed? can you not have witnessed? can he not have witnessed? can we not have witnessed? can you not have witnessed? can they not have witnessed?
Perfecto con V-ing
can I not have been witnessing? can you not have been witnessing? can he not have been witnessing? can we not have been witnessing? can you not have been witnessing? can they not have been witnessing?