I must secure you must secure he must secure we must secure you must secure they must secure
Forma con V-ing
I must be securing you must be securing he must be securing we must be securing you must be securing they must be securing
Perfecto
I must have secured you must have secured he must have secured we must have secured you must have secured they must have secured
Perfecto con V-ing
I must have been securing you must have been securing he must have been securing we must have been securing you must have been securing they must have been securing
Negación
Forma simple
I must not secure you must not secure he must not secure we must not secure you must not secure they must not secure
Forma con V-ing
I must not be securing you must not be securing he must not be securing we must not be securing you must not be securing they must not be securing
Perfecto
I must not have secured you must not have secured he must not have secured we must not have secured you must not have secured they must not have secured
Perfecto con V-ing
I must not have been securing you must not have been securing he must not have been securing we must not have been securing you must not have been securing they must not have been securing
Forma interrogativa
Forma simple
must I secure? must you secure? must he secure? must we secure? must you secure? must they secure?
Forma con V-ing
must I be securing? must you be securing? must he be securing? must we be securing? must you be securing? must they be securing?
Perfecto
must I have secured? must you have secured? must he have secured? must we have secured? must you have secured? must they have secured?
Perfecto con V-ing
must I have been securing? must you have been securing? must he have been securing? must we have been securing? must you have been securing? must they have been securing?
Forma interro-negativa
Forma simple
must I not secure? must you not secure? must he not secure? must we not secure? must you not secure? must they not secure?
Forma con V-ing
must I not be securing? must you not be securing? must he not be securing? must we not be securing? must you not be securing? must they not be securing?
Perfecto
must I not have secured? must you not have secured? must he not have secured? must we not have secured? must you not have secured? must they not have secured?
Perfecto con V-ing
must I not have been securing? must you not have been securing? must he not have been securing? must we not have been securing? must you not have been securing? must they not have been securing?