主动语态变为被动语态专项练习（一）、当我们不知道谁是动作的执行者；（二）、或者只需强调动作的承受者时，要用被动语态。主动语态变被动语态步骤：1、主语和宾语交换位置（即将原来的主语变为宾语、将原来的宾语变为主语）；2、谓语动词变为“be+V过去分词”；3、主动语态中的主语变为介词by的宾语。一般现在时的被动语态：am/are/is + V过去分词1.People play football all over the world.2.Mr. Green teaches us this term.3.We often play basketball after class.4.They use knives for cutting things.5.Mike often helps his mother to do housework.6.We use cameras for taking photos.7.They dont make cars in this factory. 8.Does
