24 这里的are to have finished是什么意思？

问：有这样一道选择题：（1）You the job now, but you haven’t.

A. are going to finish

B. are to finish

C. are to have finished

D. are about to finish

答案是C。请问：既然到现在工作还未完成，为什么要用不定式的完成时呢？

答：因为不定式的完成时可用来表示过去应完成但却来完成的动作，常可译为“本来……”。这里的“You are to have finished the job now.”即可译为：“你现在本应完成这项工作。”又如：

（2）We were to have sailed next morning.（我们本来定于第二天上午起航。）