Question

老师，帮我分析下这个句子的句子成分吧 ,谢谢 there is going to be an American

老师，帮我分析下这个句子的句子成分吧 ,谢谢
there is going to be an American film.

Answer 1

there be是倒装结构。
there is going to be an American film.
there is going to be谓语（一般将来时态）
an American film.主语

追问

但是is going to be 后面还得接一个成分吧

追答

is going to表示一般将来时，there be是“有”，是谓语；there is going to be后接的成分an American film是主语（其中 an, American是定语，修饰film）。