is十过去式是什么时态

is+过去式是一般过去时的被动语态；

was/were+动词的过去分词，主语(动作承受者) + was / were + 过去分词(+ by + 施动者)构成句型格式was / were + done ；

例 I was taught by Miss Zhao last year.去年，我是由赵老师教的。

hose letters were wirtten by a famous writer.

那些信是由一位有名作家写的。

He joined the League two years ago.

他两年前加入了联盟。

He has been in the League for two years.

他在联盟已经两年了。

It is two years since he joined the League.

他加入联盟已有两年了。

Two years has passed since he joined the Leagu

他入伍两年了