I must loosen you must loosen he must loosen we must loosen you must loosen they must loosen
V-ing form
I must be loosening you must be loosening he must be loosening we must be loosening you must be loosening they must be loosening
Perfect
I must have loosened you must have loosened he must have loosened we must have loosened you must have loosened they must have loosened
V-ing perfect
I must have been loosening you must have been loosening he must have been loosening we must have been loosening you must have been loosening they must have been loosening
Negation
Simple form
I must not loosen you must not loosen he must not loosen we must not loosen you must not loosen they must not loosen
V-ing form
I must not be loosening you must not be loosening he must not be loosening we must not be loosening you must not be loosening they must not be loosening
Perfect
I must not have loosened you must not have loosened he must not have loosened we must not have loosened you must not have loosened they must not have loosened
V-ing perfect
I must not have been loosening you must not have been loosening he must not have been loosening we must not have been loosening you must not have been loosening they must not have been loosening
Interrogative form
Simple form
must I loosen? must you loosen? must he loosen? must we loosen? must you loosen? must they loosen?
V-ing form
must I be loosening? must you be loosening? must he be loosening? must we be loosening? must you be loosening? must they be loosening?
Perfect
must I have loosened? must you have loosened? must he have loosened? must we have loosened? must you have loosened? must they have loosened?
V-ing perfect
must I have been loosening? must you have been loosening? must he have been loosening? must we have been loosening? must you have been loosening? must they have been loosening?
Interro-negative form
Simple form
must I not loosen? must you not loosen? must he not loosen? must we not loosen? must you not loosen? must they not loosen?
V-ing form
must I not be loosening? must you not be loosening? must he not be loosening? must we not be loosening? must you not be loosening? must they not be loosening?
Perfect
must I not have loosened? must you not have loosened? must he not have loosened? must we not have loosened? must you not have loosened? must they not have loosened?
V-ing perfect
must I not have been loosening? must you not have been loosening? must he not have been loosening? must we not have been loosening? must you not have been loosening? must they not have been loosening?