what nationality is __ ————(him、his、 he)?

what nationality is __ ————(him、his、 he)? What is his nationality 和What natinality is he What nationality are you?or What nationality is he? what nationality is he这句的he为什么不用him what is his nationality 后面如何回答? 那 What nationality is he?what 作什么成分?定语? His wife has made him what he is. What about (him/he/his)? What nationality is Mr.Brown?He's American. —what is Jack doing?—He is inviting his f ( ) 4.— What is Peter doing?— He ________ his mother ______ what's David doing?——He is b with his homework.后面加什么?