The writer had lost his money.He felt upset.He must have been worried.请问:为什么要用have been,好象不是被动语态啊
问题描述：
The writer had lost his money.He felt upset.He must have been worried.
请问:为什么要用have been,好象不是被动语态啊
答
这是对过去发生事情的推测的说法，sb. must have done sth..例如：he looks so happy,he must have passed the exam.这里be是构成be worried，理解为一种焦急的状态。
答
这里不是被动语态。是对过去的肯定虚拟语气和处于焦急的状态。
sb be worried
must have been.他那时肯定很着急
答
基于前面的had lost过去完成时,后面的时态延后一个时态,即现在完成时
答
be worried about sth,是worry的一种用法，不是表示被动。