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