i think you meant 'present perfect tense' in its ing form

来源: 2009-05-08 18:02:33 [博客] [旧帖] [给我悄悄话] 本文已被阅读:

i don't have any grammar book. but it appears to be ok. passive tense may also be fine. for instance 'being forced to quit a job is disheartening' may be grammatically correct;