That he is still alive is sheer luck.这句话为什么出现两个be

That he is still alive is sheer luck.他还活着全靠运气 That he is still alive is a wonder.直接用 He is still alive is Is she still alive that her luck.这句符合语法吗? That she is still alive is her luck句子结构分析求大神帮助 it's hard to believe that he is still （alive）（live）,这两个单词有区别 I am doubtful----he is still alive That she is still alive is true.that充当什么? I have a/an ____ that he is still alive.(feeling,impression) it is so sorry that i am still alive He's alive----his heart is still b___ 幸好他还活着,_____,he is still alive He is lucky to be alive after being in that accident.