Choose the correct pronoun to complete the sentences: 1. (who/ whom) should i send and (who/ whom) will go with me? 2. the congregation enjoyed (them/ their) playing the piano at the service. 3. veterans day honors our soldiers, for (who's/ whose) sacrifice we must be grateful.

1. whom should i send and who will go with me? think about this rule in terms of he/him--you would say "i should send him" and "he will go with me".  2. the congregation enjoyed their playing the piano at the service.playing in this sentence is a gerund, and a gerund is always preceded by a possessive pronoun.  3. veterans day honors our soldiers, for whose sacrifice we must be grateful.who's is a contraction for 'who is', which would not slot in and make sense in the sentence, 'whose' is possessive. 

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