问，现在分词可不可以做主语？

such as
Having studied
etc

所有跟帖： 

• 抛砖引玉 -billnet- ♂ (335 bytes) () 05/08/2009 postreply 12:14:47

• i think you meant 'present perfect tense' in its ing form -justjust- ♂ (179 bytes) () 05/08/2009 postreply 18:02:33

• 刚google 了一下，刘全国的解释比较全 -billnet- ♂ (615 bytes) () 05/08/2009 postreply 19:58:01

• you did not understand grep's question -justjust- ♂ (115 bytes) () 05/08/2009 postreply 20:09:55

• likely people would put -justjust- ♂ (33 bytes) () 05/08/2009 postreply 20:20:51

• I agree with you, just. this form can be a subject. -戏雨飞鹰- ♀ (0 bytes) () 05/08/2009 postreply 21:32:37

• I might have neglected that ... -billnet- ♂ (756 bytes) () 05/08/2009 postreply 21:57:21

• thank you all for help -grep- ♀ (0 bytes) () 05/09/2009 postreply 17:29:10