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 must not navigate you must not navigate he must not navigate we must not navigate you must not navigate they must not navigate
V-ing form
I must not be navigating you must not be navigating he must not be navigating we must not be navigating you must not be navigating they must not be navigating
Perfect
I must not have navigated you must not have navigated he must not have navigated we must not have navigated you must not have navigated they must not have navigated
V-ing perfect
I must not have been navigating you must not have been navigating he must not have been navigating we must not have been navigating you must not have been navigating they must not 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
must I not navigate? must you not navigate? must he not navigate? must we not navigate? must you not navigate? must they not navigate?
V-ing form
must I not be navigating? must you not be navigating? must he not be navigating? must we not be navigating? must you not be navigating? must they not be navigating?
Perfect
must I not have navigated? must you not have navigated? must he not have navigated? must we not have navigated? must you not have navigated? must they not have navigated?
V-ing perfect
must I not have been navigating? must you not have been navigating? must he not have been navigating? must we not have been navigating? must you not have been navigating? must they not have been navigating?