gmat.2008 wrote:sir ,
i still have a doubt.
we tell that When action is "of ongoing nature" then we use progressive tense. we also tell that when action is "still going" we use present perfect.
please clarify this doubt. when to use present perfect and when to use continous?
one more point has come that why we cannt use labor's unqualifying support???
Thanks for your question. It's true that the progressive tense is for actions of an "ongoing nature". But it's also important to think about the word that the participle is modifying.
In this case, "unqualifying/unqualified" is modifying the word "support." With the present participle, the "support" is the subject of the unqualifying. In the case of the past participle, the "support" is the object of the unqualifying. The latter case is the sensible one, because in this case it is labor (the subject) that is not qualifying their support (the object).
In this case, thinking about the tense of the participle is less useful than thinking about the subject and object of the participle.
Is that helpful?