题目内容：

英语,关于passive voice的问题
Have they fed the dog yet?
My sister never gives me brithday presents.
这两句具体怎么转换成passive voice的句式呢?还有p.p.就是过去分词大多是原动词加ed还是en啊?谢谢了···好的再加分···谢谢了!
为什么都用been呢？不是现在式只要is/am/are加pp吗？不是只有现在完成式才是is/am/are加been

优质解答

>>Has the dog been fed by them yet?
>>I have never been given birthday presents by my sister.
passive voice 用过完吧