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