英语被动形态是什么时候可以省略be动词，请详细解答，最好再附几个例子

你好，一般情况下，被动语态中的助动词 be 都不可以省略，只有在过去分词短语中才台省略。第一个例子中的 is performed 属于被动语态，充当句子的谓语，其中的助动词 is 是不能省略的；第二个例子中的 affected by tea culture 实际上是一个过去分词短语，充当名词 country 的定语；过去分词短语表被动的含义，但过去分词前面不带助动词 be。此过去分词也可以转换成一个定语从句：The European country that is most affected by tea culture.注意，过去分词短语转换成从句之后，过去分词前面必须加上助动词 be。另外，The European country most ( affected ) by tea culture 不是一个句子，只是一个短语而已，完整的句子应该是TheUK, however, istheEuropeancountrymost affected byteaculture.又如：1. My new bike was stolen by a thief yesteray.其中的 was stolen（助动词 was + 过去分词）属于被动语态，充当句子的谓语，助动词 was 不能省略。2. The western children were able to watch a new movie program called Monkey in 1979.其中的 called Monkey 属于过去分词短语，过去分词 called 前面不带助动词 be。原句 ＝The western children were able to watch a new movie program called Monkey in 1979.