1 . 是
wereit not for 若不是有were是weren't 不是
2 . 被
The police werebaffled , and Sherlock Holm was called in to investigate ., 警方被难住了 , 于是请福尔摩斯前来侦查.
3 . 都
The principal conquests of the Romans wereachieved under the republic ;, 罗马主要的征服都是在共和体制之下完成;
4 . 正
Now we weredriving to Sevilla , I took some pictures in the car ., 现在我们正驾车前往塞尔维亚 , 在车上我拍了一些像片.