I must burrow you must burrow she must burrow we must burrow you must burrow they must burrow
Forma con V-ing
I must be burrowing you must be burrowing she must be burrowing we must be burrowing you must be burrowing they must be burrowing
Perfecto
I must have burrowed you must have burrowed she must have burrowed we must have burrowed you must have burrowed they must have burrowed
Perfecto con V-ing
I must have been burrowing you must have been burrowing she must have been burrowing we must have been burrowing you must have been burrowing they must have been burrowing
Negación
Forma simple
I must not burrow you must not burrow she must not burrow we must not burrow you must not burrow they must not burrow
Forma con V-ing
I must not be burrowing you must not be burrowing she must not be burrowing we must not be burrowing you must not be burrowing they must not be burrowing
Perfecto
I must not have burrowed you must not have burrowed she must not have burrowed we must not have burrowed you must not have burrowed they must not have burrowed
Perfecto con V-ing
I must not have been burrowing you must not have been burrowing she must not have been burrowing we must not have been burrowing you must not have been burrowing they must not have been burrowing
Forma interrogativa
Forma simple
must I burrow? must you burrow? must she burrow? must we burrow? must you burrow? must they burrow?
Forma con V-ing
must I be burrowing? must you be burrowing? must she be burrowing? must we be burrowing? must you be burrowing? must they be burrowing?
Perfecto
must I have burrowed? must you have burrowed? must she have burrowed? must we have burrowed? must you have burrowed? must they have burrowed?
Perfecto con V-ing
must I have been burrowing? must you have been burrowing? must she have been burrowing? must we have been burrowing? must you have been burrowing? must they have been burrowing?
Forma interro-negativa
Forma simple
must I not burrow? must you not burrow? must she not burrow? must we not burrow? must you not burrow? must they not burrow?
Forma con V-ing
must I not be burrowing? must you not be burrowing? must she not be burrowing? must we not be burrowing? must you not be burrowing? must they not be burrowing?
Perfecto
must I not have burrowed? must you not have burrowed? must she not have burrowed? must we not have burrowed? must you not have burrowed? must they not have burrowed?
Perfecto con V-ing
must I not have been burrowing? must you not have been burrowing? must she not have been burrowing? must we not have been burrowing? must you not have been burrowing? must they not have been burrowing?