分词作后置定语

2.分词作定语：(1).被修饰的名词于作定语的动词为主动关系，表示该动作正在进行或于主句动作同时发生，或是经常性行为时，用现在分词做定语。Thegirl(standingthere)ismysister.WhenIgotbackhomeIsawamessagepinnedtothedoor(reading“sorrytomissyou;willcalllater).注意；分词短语作后置定语时可以改写成定语从句。Thegirl(whoisstandingthere)ismysister.WhenIgotbackhomeIsawamessagepinnedtothedoor(whichread“sorrytomissyou;willcalllater).(2).如果名词与作定语的动词为被动关系时，则定语有下列三种形式：如果动作已发生或经常性行为，用doneThehousebuiltismine.如果动作正在进行，用beingdoneThehousebeingbuiltismine.如果动作未发生，用tobedoneThehousetobebuiltismine.Atthebeginningofclass,thenoiseofdesks_____couldbeheardoutsidetheclassroom.A.openedandclosedB.tobeopenedandclosedC.beingopenedandclosed