在表示一個被動動作時，如果這個動作正在進行，或是與謂語表示的動作同時發生，我們可以用現在分詞的被動形式。

【例如】

The bridge being built now will be completed in three months.This is one of the experiments being carried on in our laboratory.

Being surrounded by the students, the teacher was answering questions one by one.

If I correct someone, I will do it with as much good humor and self-restraint as if I were the one ____. (CET-4 1996,6)

A) to correct B) correcting C)shavingscorrected D) being corrected

句意為：如果我批評某個人，我會盡量保持幽默，自我控制，像批評自己一樣。one為代詞，后面的動詞為其修飾成分，故用分詞，而且one與correct之間是動賓關系，故用分詞被動式，答案為D。