I'm happy for (the) students (who are) winning the award. It is very bad style because of the ambiguity. For clarity, I would not omit the relative pronoun and helping verb.
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AlpheccaStarsI'm glad that you are winning the award.It seems to me that this could only be used when the action of winning happens. Suppose I meet a friend months later but still want to congratulate his winning. Is it of good style to say
whispering"I'm glad for your winning that award"?it is grammatical, but not natural. Native speakers would not phrase the idea that way.
whisperingIt seems to me that this could only be used when the action of winning happens.Quite right. The winning is in progress, but not yet assured.
linguist27'I'm glad you have won that award' must be the more natural way of saying it.See the correction. The simple past would be used if the event happened some time ago.
AlpheccaStarsit is grammatical, but not natural. Native speakers would not phrase the idea that way.But this would also be common
linguist27Personally i would say ''I am glad of the chance to hear that you won the award!But that changes the meaning of the poster's original sentence.