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一般时态的被动形式都由“助动词 be+过去分词”构成（动作发生时间由be 表现出来）。
How is this word pronounced ?
Many accidents are caused by careless driving.
Their wedding was held in a church.
A banquet was given in honour of them.
The conference will be held in Hague.
The rostrum will be decorated with fresh flowers.
They were afraid the city would be bombarded .
She seldom thought she would be rewarded .
进行时态的被动形式都由“助动词 be+being+过去分词”构成：
The room is being cleaned at the moment.
Your steak is being grilled.
They told me that the case was being investigated.
We couldn't use the office.It was being redecorated.
完成时态的被动形式都以“has (have, had)+been+过去分词”构成：
Has the mail been delivered yet?
A spaceship has recently been launched .
All the tickets have been sold out .
It was the first time he had been bitten by a dog.
The new railway had already been opened .
将来完成时和过去将来完成时很少用于被动结构。完成进行时也都没有被动结构。