现在进行时被动语态am / is / are + being + 及物动词的过去分词
Uncle Wang is mending my bike now.→
My bike is being repaired by Tom now.
They are planting trees over there.→
Trees are being planted over there by them.
个人认为就是正在进行中的事情主语为事情的承受者
一般过去时被动语态was / were + 及物动词的过去分词
A new shop was built last year.
Dinosaur eggs were laid long long ago.
发生在过去
一般现在时被动语态is / am / are + 及物动词的过去分词
Our classroom is cleaned everyday.
I am asked to study hard.
Knives are used for cutting things.
现在发生的最平常的事情
希望能帮上忙