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