I must tear you must tear she must tear we must tear you must tear they must tear
V-ing form
I must be tearing you must be tearing she must be tearing we must be tearing you must be tearing they must be tearing
Perfect
I must have torn you must have torn she must have torn we must have torn you must have torn they must have torn
V-ing perfect
I must have been tearing you must have been tearing she must have been tearing we must have been tearing you must have been tearing they must have been tearing
Negation
Simple form
I mustn't tear you mustn't tear she mustn't tear we mustn't tear you mustn't tear they mustn't tear
V-ing form
I mustn't be tearing you mustn't be tearing she mustn't be tearing we mustn't be tearing you mustn't be tearing they mustn't be tearing
Perfect
I mustn't have torn you mustn't have torn she mustn't have torn we mustn't have torn you mustn't have torn they mustn't have torn
V-ing perfect
I mustn't have been tearing you mustn't have been tearing she mustn't have been tearing we mustn't have been tearing you mustn't have been tearing they mustn't have been tearing
Interrogative form
Simple form
must I tear? must you tear? must she tear? must we tear? must you tear? must they tear?
V-ing form
must I be tearing? must you be tearing? must she be tearing? must we be tearing? must you be tearing? must they be tearing?
Perfect
must I have torn? must you have torn? must she have torn? must we have torn? must you have torn? must they have torn?
V-ing perfect
must I have been tearing? must you have been tearing? must she have been tearing? must we have been tearing? must you have been tearing? must they have been tearing?
Interro-negative form
Simple form
mustn't I tear? mustn't you tear? mustn't she tear? mustn't we tear? mustn't you tear? mustn't they tear?
V-ing form
mustn't I be tearing? mustn't you be tearing? mustn't she be tearing? mustn't we be tearing? mustn't you be tearing? mustn't they be tearing?
Perfect
mustn't I have torn? mustn't you have torn? mustn't she have torn? mustn't we have torn? mustn't you have torn? mustn't they have torn?
V-ing perfect
mustn't I have been tearing? mustn't you have been tearing? mustn't she have been tearing? mustn't we have been tearing? mustn't you have been tearing? mustn't they have been tearing?