I must prospect you must prospect he must prospect we must prospect you must prospect they must prospect
V-ing form
I must be prospecting you must be prospecting he must be prospecting we must be prospecting you must be prospecting they must be prospecting
Perfect
I must have prospected you must have prospected he must have prospected we must have prospected you must have prospected they must have prospected
V-ing perfect
I must have been prospecting you must have been prospecting he must have been prospecting we must have been prospecting you must have been prospecting they must have been prospecting
Negation
Simple form
I mustn't prospect you mustn't prospect he mustn't prospect we mustn't prospect you mustn't prospect they mustn't prospect
V-ing form
I mustn't be prospecting you mustn't be prospecting he mustn't be prospecting we mustn't be prospecting you mustn't be prospecting they mustn't be prospecting
Perfect
I mustn't have prospected you mustn't have prospected he mustn't have prospected we mustn't have prospected you mustn't have prospected they mustn't have prospected
V-ing perfect
I mustn't have been prospecting you mustn't have been prospecting he mustn't have been prospecting we mustn't have been prospecting you mustn't have been prospecting they mustn't have been prospecting
Interrogative form
Simple form
must I prospect? must you prospect? must he prospect? must we prospect? must you prospect? must they prospect?
V-ing form
must I be prospecting? must you be prospecting? must he be prospecting? must we be prospecting? must you be prospecting? must they be prospecting?
Perfect
must I have prospected? must you have prospected? must he have prospected? must we have prospected? must you have prospected? must they have prospected?
V-ing perfect
must I have been prospecting? must you have been prospecting? must he have been prospecting? must we have been prospecting? must you have been prospecting? must they have been prospecting?
Interro-negative form
Simple form
mustn't I prospect? mustn't you prospect? mustn't he prospect? mustn't we prospect? mustn't you prospect? mustn't they prospect?
V-ing form
mustn't I be prospecting? mustn't you be prospecting? mustn't he be prospecting? mustn't we be prospecting? mustn't you be prospecting? mustn't they be prospecting?
Perfect
mustn't I have prospected? mustn't you have prospected? mustn't he have prospected? mustn't we have prospected? mustn't you have prospected? mustn't they have prospected?
V-ing perfect
mustn't I have been prospecting? mustn't you have been prospecting? mustn't he have been prospecting? mustn't we have been prospecting? mustn't you have been prospecting? mustn't they have been prospecting?