人教版高中英语必修第二册19年版Unit3Theinternet词汇语法(16)

5. 不是所有动词都可以用被动语态，如happen, take place, break out, belong to, cost, last等不及物动词或词组无被动语态。有些动词如open，break，
drop等不强调动作发出者时，我们通常用主动语态。例句：
Something bad has happened to him.
The door has opened of itself.