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