he was happy to be home .为什么用to be

He was happy to be made the host.为什么不用to?不是说被动语态中要变成be made He seemed to be happy. He was nowhere to be seen.为什么要用不定式 There was to be happy because He'd like (anyone)to be happy He seems to be very happy. 翻译：he was as happy as it is given to a man to be. we are happy to be together to be together 是不是动词不定式.为什么是用be There being no bus,he had to walk home.为什么用there be? to be happy and be happy to how to be happy