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被动语态(be + 过去分词)关注的是动作本身或动作的承受者,而不是谁做的。当动作的执行者未知、不重要,或从上下文中显而易见时使用被动语态。
The letter was send yesterday.
The letter was sent yesterday. — 使用过去分词(sent),而不是原形。
The cake is baking by my mother.
The cake is baked by my mother. — 使用被动形式 "is baked",而不是进行时。
This house was built in 1990.
Spanish is spoken in Mexico.