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