I must whistle-stop you must whistle-stop she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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 she 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?