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