beingdone的问题.done的用法和过去分词的用法.参考：1.whencompleted,themuseumwillbeopenedtothepublic.2.Putintousein2000,thehotlinewasmeantforresidentsreportingwaterandheatingsupplybreakdowns.

Question

being done的问题.
done的用法和过去分词的用法.
参考：1.when completed,the museum will be opened to the public.
2.Put into use in 2000,the hotline was meant for residents reporting water and heating supply breakdowns.

Answer 1

being done:
如果主语是被动做某事,就用be done.
你举的例子就是这种情况.只要根据时态把be 动词变化就可以.

如果主语是被动做某事而且正在做就用being done.
eg.1.the building is being washed by the workers now.