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（1）当不知道或没有必要指出动作的执行者时，这时往往不用by 短语。 如： “Mr. White, the cup was broken after class. ” 怀特先生，这只茶杯是下课后被打碎的。 （2）突出或强调动作的承受者，如果需要说出动作的执行者，用by 短语。 如： These records were made by John Denver. 这些报道是被约翰·丹佛做的。 被动语态中谓语动词的基本构成 be + done 被动语态的构成 （1）一般现在时：am / is / are + done。 如： ①People grow rice in the south of the country. →Rice is grown in the south of the country. 稻米在这个国家的南部被种植。 ②The school doesn’t allow us to enter the chemistry lab without a teacher. →We are not allowed to enter the chemistry lab without a teacher. 我们不被允许在没有老师的情况下进入化学实验室。 （2）一般过去时：was / were + done。 如： ①They agreed on the building of a new car factory last month. →The building of a new car factory was agreed on last month. 建立一个新的汽车工厂在上个月被一致同意。 ②The students didn’t forget their lessons easily. →Their lessons were not easily forgotten. 他们的功课没有被轻易遗忘。 (责任编辑：admin) |