are的过去式和过去分词
例句：
Their efforts were unavailing.
他们的努力都付诸东流。
Her parents were Albanian.
她的父母是阿尔巴尼亚人。
The doors were padlocked.
门都用挂锁锁着。
You could have been killed!
你本可能被杀了。
These figures have been disputed.
有人对这些数字提出了质疑。
What've you been up to?
你一直在搞什么名堂？
