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