I must motorboat you must motorboat he must motorboat we must motorboat you must motorboat they must motorboat
V-ing form
I must be motorboating you must be motorboating he must be motorboating we must be motorboating you must be motorboating they must be motorboating
Perfect
I must have motorboated you must have motorboated he must have motorboated we must have motorboated you must have motorboated they must have motorboated
V-ing perfect
I must have been motorboating you must have been motorboating he must have been motorboating we must have been motorboating you must have been motorboating they must have been motorboating
Negation
Simple form
I must not motorboat you must not motorboat he must not motorboat we must not motorboat you must not motorboat they must not motorboat
V-ing form
I must not be motorboating you must not be motorboating he must not be motorboating we must not be motorboating you must not be motorboating they must not be motorboating
Perfect
I must not have motorboated you must not have motorboated he must not have motorboated we must not have motorboated you must not have motorboated they must not have motorboated
V-ing perfect
I must not have been motorboating you must not have been motorboating he must not have been motorboating we must not have been motorboating you must not have been motorboating they must not have been motorboating
Interrogative form
Simple form
must I motorboat? must you motorboat? must he motorboat? must we motorboat? must you motorboat? must they motorboat?
V-ing form
must I be motorboating? must you be motorboating? must he be motorboating? must we be motorboating? must you be motorboating? must they be motorboating?
Perfect
must I have motorboated? must you have motorboated? must he have motorboated? must we have motorboated? must you have motorboated? must they have motorboated?
V-ing perfect
must I have been motorboating? must you have been motorboating? must he have been motorboating? must we have been motorboating? must you have been motorboating? must they have been motorboating?
Interro-negative form
Simple form
must I not motorboat? must you not motorboat? must he not motorboat? must we not motorboat? must you not motorboat? must they not motorboat?
V-ing form
must I not be motorboating? must you not be motorboating? must he not be motorboating? must we not be motorboating? must you not be motorboating? must they not be motorboating?
Perfect
must I not have motorboated? must you not have motorboated? must he not have motorboated? must we not have motorboated? must you not have motorboated? must they not have motorboated?
V-ing perfect
must I not have been motorboating? must you not have been motorboating? must he not have been motorboating? must we not have been motorboating? must you not have been motorboating? must they not have been motorboating?