she's sure to be successful.to be 后为什么是接形容词?而不是用名词success.

be 是连系动词,后面能跟形容词,跟名词时需要加冠词.
以下说法是正确的.
She is successful.
She succeed.
It is a success.I want to be someone.这里面someone是名词吧,那怎么不要在其前加冠词?someone是代詞，不是名詞。代詞和一些特殊名詞前不用加冠詞，這都是最基本的語法，課本上有。to be 后可以接介詞，如：This is the place to be for You next Vacation.