主语(动作接受者) + is / am / are + 动词的过去分词+ (by+ 动作执行者)
1.We are allowed to go out.（我们被允许外出）2.The questions were answered in public.（问题被公开答复了 ）3.This shirt is washed once a week.（ 这件T恤一周洗一次）
被动语态的用法：
（1）要表达“被…” 、“受…”、“让…”、“遭…”之类的语义.The teachers are well respected.（老师们很受尊敬。）The child is well loved by people.（这孩子很受人们的喜爱。）(2)强调动作承受者.He is known far and wide.他远近闻名.(3)不知道式没有必要指出动作的执行者.The room is cleaned every day.房子每天都有人打扫.(4)为礼貌起见避免提及动作执行者.I wonder if I was allowed to introduce myself?我是否可以做自我介绍?
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