"The actors have to have been rehearsing for the new musical" 嚟个写法岩唔岩啊?

這句話重點在以to have + pp 來表示過去式，所以本句翻譯成演奏家們之前就需持續演練新曲目，用進行式表時段(一段時間)，若這句寫成The actors have to rehearse for the new musical. 翻譯成演奏家們需持續演綀新曲目，觀念通即迎刃而解，英文時式用法知道後，就可精確知道其真意。

The actors have to have been rehearsing for the new musical.(X)
The actors must have been rehearsing for the new musical. (O)

The actors have already been rehearsing for the new musical. Yip