I must decorate you must decorate he must decorate we must decorate you must decorate they must decorate
V-ing form
I must be decorating you must be decorating he must be decorating we must be decorating you must be decorating they must be decorating
Perfect
I must have decorated you must have decorated he must have decorated we must have decorated you must have decorated they must have decorated
V-ing perfect
I must have been decorating you must have been decorating he must have been decorating we must have been decorating you must have been decorating they must have been decorating
Negation
Simple form
I must not decorate you must not decorate he must not decorate we must not decorate you must not decorate they must not decorate
V-ing form
I must not be decorating you must not be decorating he must not be decorating we must not be decorating you must not be decorating they must not be decorating
Perfect
I must not have decorated you must not have decorated he must not have decorated we must not have decorated you must not have decorated they must not have decorated
V-ing perfect
I must not have been decorating you must not have been decorating he must not have been decorating we must not have been decorating you must not have been decorating they must not have been decorating
Interrogative form
Simple form
must I decorate? must you decorate? must he decorate? must we decorate? must you decorate? must they decorate?
V-ing form
must I be decorating? must you be decorating? must he be decorating? must we be decorating? must you be decorating? must they be decorating?
Perfect
must I have decorated? must you have decorated? must he have decorated? must we have decorated? must you have decorated? must they have decorated?
V-ing perfect
must I have been decorating? must you have been decorating? must he have been decorating? must we have been decorating? must you have been decorating? must they have been decorating?
Interro-negative form
Simple form
must I not decorate? must you not decorate? must he not decorate? must we not decorate? must you not decorate? must they not decorate?
V-ing form
must I not be decorating? must you not be decorating? must he not be decorating? must we not be decorating? must you not be decorating? must they not be decorating?
Perfect
must I not have decorated? must you not have decorated? must he not have decorated? must we not have decorated? must you not have decorated? must they not have decorated?
V-ing perfect
must I not have been decorating? must you not have been decorating? must he not have been decorating? must we not have been decorating? must you not have been decorating? must they not have been decorating?