英语中一般现在时的被动语态

一般现在时的被动语态,其主要结构为:
★主语(动作接受者) + is / am / are + 动词的过去分词+ (by+ 动作执行者)
Football is played in most countries in the world.
被动语态的句型总结如下:
肯定句:主语 + be + 过去分词 + (by ).
The boy is called Jack.
否定句:主语 + be not+ 过去分词 + (by ).
The baby is not looked after by his father.
一般疑问句:Be +主语 + 过去分词 + (by
Is King Lear written by Shakespeare?
特殊疑问句:特殊疑词+ be + 过去分词 + (by
What is this kind of sweater made of?
★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.
The child is well loved by people.
(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?