被动语态详解
在英语中，当我们想要强调动作的承受者而非执行者时，就会使用被动语态。让我们用“踢球”这个例子，来看看不同时态下被动语态的构成：
1. 一般现在时: am/is/are + 过去分词
例句: The ball is played every day. (这个球每天都被踢。)
2. 一般过去时: was/were + 过去分词
例句: The ball was played yesterday. (这个球昨天被踢了。)
3. 一般将来时: will be + 过去分词 或 be (am/is/are) going to be + 过去分词
例句: The ball will be played tomorrow. (这个球明天将会被踢。)
例句: The ball is going to be played tomorrow. (这个球明天将会被踢。)
4. 现在进行时: am/is/are + being + 过去分词
例句: The ball is being played now. (这个球正在被踢。)
5. 过去进行时: was/were + being + 过去分词
例句: The ball was being played at ten yesterday. (这个球昨天晚上10点正在被踢。)
6. 现在完成时: have/has + been + 过去分词
例句: The ball has been played for two hours. (这个球已经被踢了两个小时了。)
7. 过去完成时: had + been + 过去分词
例句: The ball had been played for two hours by the time you got here. (在你到达这里之前，这个球已经被踢了两个小时了。)
8. 将来完成时: will have + been + 过去分词
例句: The ball will have been played for two days by ten tomorrow evening. (到明天晚上10点之前，这个球将已经被踢了两天了。)