Active: I bought a pen.
Passive: The pen was bought.
Active: I took a test.
Passive: The test has been taken.
2013年6月12日
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We have active and passive voice(sentence)
Ex1: He broke the window.
EX2: The window is broken.
In the first example we know the subject,but in the second one we don't.
The window is broken(we don't know who has broken the window! by whom?)