I must shallow you must shallow he must shallow we must shallow you must shallow they must shallow
V-ing form
I must be shallowing you must be shallowing he must be shallowing we must be shallowing you must be shallowing they must be shallowing
Perfect
I must have shallowed you must have shallowed he must have shallowed we must have shallowed you must have shallowed they must have shallowed
V-ing perfect
I must have been shallowing you must have been shallowing he must have been shallowing we must have been shallowing you must have been shallowing they must have been shallowing
Negation
Simple form
I must not shallow you must not shallow he must not shallow we must not shallow you must not shallow they must not shallow
V-ing form
I must not be shallowing you must not be shallowing he must not be shallowing we must not be shallowing you must not be shallowing they must not be shallowing
Perfect
I must not have shallowed you must not have shallowed he must not have shallowed we must not have shallowed you must not have shallowed they must not have shallowed
V-ing perfect
I must not have been shallowing you must not have been shallowing he must not have been shallowing we must not have been shallowing you must not have been shallowing they must not have been shallowing
Interrogative form
Simple form
must I shallow? must you shallow? must he shallow? must we shallow? must you shallow? must they shallow?
V-ing form
must I be shallowing? must you be shallowing? must he be shallowing? must we be shallowing? must you be shallowing? must they be shallowing?
Perfect
must I have shallowed? must you have shallowed? must he have shallowed? must we have shallowed? must you have shallowed? must they have shallowed?
V-ing perfect
must I have been shallowing? must you have been shallowing? must he have been shallowing? must we have been shallowing? must you have been shallowing? must they have been shallowing?
Interro-negative form
Simple form
must I not shallow? must you not shallow? must he not shallow? must we not shallow? must you not shallow? must they not shallow?
V-ing form
must I not be shallowing? must you not be shallowing? must he not be shallowing? must we not be shallowing? must you not be shallowing? must they not be shallowing?
Perfect
must I not have shallowed? must you not have shallowed? must he not have shallowed? must we not have shallowed? must you not have shallowed? must they not have shallowed?
V-ing perfect
must I not have been shallowing? must you not have been shallowing? must he not have been shallowing? must we not have been shallowing? must you not have been shallowing? must they not have been shallowing?