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