I must whistle-stop you must whistle-stop he must whistle-stop we must whistle-stop you must whistle-stop they must whistle-stop
V-ing form
I must be whistle-stoping you must be whistle-stoping he must be whistle-stoping we must be whistle-stoping you must be whistle-stoping they must be whistle-stoping
Perfect
I must have whistle-stoped you must have whistle-stoped he must have whistle-stoped we must have whistle-stoped you must have whistle-stoped they must have whistle-stoped
V-ing perfect
I must have been whistle-stoping you must have been whistle-stoping he must have been whistle-stoping we must have been whistle-stoping you must have been whistle-stoping they must have been whistle-stoping
Negation
Simple form
I must not whistle-stop you must not whistle-stop he must not whistle-stop we must not whistle-stop you must not whistle-stop they must not whistle-stop
V-ing form
I must not be whistle-stoping you must not be whistle-stoping he must not be whistle-stoping we must not be whistle-stoping you must not be whistle-stoping they must not be whistle-stoping
Perfect
I must not have whistle-stoped you must not have whistle-stoped he must not have whistle-stoped we must not have whistle-stoped you must not have whistle-stoped they must not have whistle-stoped
V-ing perfect
I must not have been whistle-stoping you must not have been whistle-stoping he must not have been whistle-stoping we must not have been whistle-stoping you must not have been whistle-stoping they must not have been whistle-stoping
Interrogative form
Simple form
must I whistle-stop? must you whistle-stop? must he whistle-stop? must we whistle-stop? must you whistle-stop? must they whistle-stop?
V-ing form
must I be whistle-stoping? must you be whistle-stoping? must he be whistle-stoping? must we be whistle-stoping? must you be whistle-stoping? must they be whistle-stoping?
Perfect
must I have whistle-stoped? must you have whistle-stoped? must he have whistle-stoped? must we have whistle-stoped? must you have whistle-stoped? must they have whistle-stoped?
V-ing perfect
must I have been whistle-stoping? must you have been whistle-stoping? must he have been whistle-stoping? must we have been whistle-stoping? must you have been whistle-stoping? must they have been whistle-stoping?
Interro-negative form
Simple form
must I not whistle-stop? must you not whistle-stop? must he not whistle-stop? must we not whistle-stop? must you not whistle-stop? must they not whistle-stop?
V-ing form
must I not be whistle-stoping? must you not be whistle-stoping? must he not be whistle-stoping? must we not be whistle-stoping? must you not be whistle-stoping? must they not be whistle-stoping?
Perfect
must I not have whistle-stoped? must you not have whistle-stoped? must he not have whistle-stoped? must we not have whistle-stoped? must you not have whistle-stoped? must they not have whistle-stoped?
V-ing perfect
must I not have been whistle-stoping? must you not have been whistle-stoping? must he not have been whistle-stoping? must we not have been whistle-stoping? must you not have been whistle-stoping? must they not have been whistle-stoping?