is being done：现在进⾏时的被动语态，就是某物正被怎么样，这强调的是正在进⾏的
The building is being built now.这座建筑物正在被修
The door is being repaired now.门正在维修中。/门正在被修
被动形式动名词
1，做主语（少见）
Being unemployed entitles you to free medical treatment.失业可以享受免费医疗。
Being compared to Abba is a great compliment.被与Abba乐队相比（对我）是一种谬赞。
2，做某些及物动词或介词的宾语（多见）
He can't bear being laughed at.他受不了别人的嘲笑。
I'm fed up with being put upon by my boss all the time.我受够了老板老是欺负我。
There is no longer any stigma to being divorced.离婚不再是种耻辱。
is
不及物动词 vi.
1、(用于第三人称单数现在时)是[L]
The picture on the wall is beautiful.墙上的画很美.
Mr. Smith is a very good English teacher.
史密斯先生是个很好的英语教师.
助词 v.aux.
1、(与v-ing连用构成现在进行时与v-ed连用构成被动语态)
Mr. Ward is known as a great painter.
沃德先生是一位遐迩闻名的大画家.
What is she doing over there?
她在那儿做什么?
