subgroup modifier

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paes: Legendary Member; Posts: 995; Joined: Tue Apr 13, 2010 11:56 pm; Thanked: 31 times; Followed by:1 members

subgroup modifier

by paes » Tue Aug 17, 2010 2:27 am

Mgmat (Page-236) is giving following examples to modify a subgroup :

(i) This model explains all known subatomic particles, some of which were only recently discovered.

(ii) This model explains all known subatomic particles, some of them only recently discovered.

(iii) This model explains all known subatomic particles, some only recently discovered.

Can somebody explain me why 'were' is used for (i) not for (ii)/(iii)

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Source: Beat The GMAT — Sentence Correction | Tue Aug 17, 2010 2:27 am

paes: Legendary Member; Posts: 995; Joined: Tue Apr 13, 2010 11:56 pm; Thanked: 31 times; Followed by:1 members

by paes » Tue Aug 17, 2010 6:27 pm

can somebody plz explain the above usages ?

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lilisanei: Senior | Next Rank: 100 Posts; Posts: 35; Joined: Wed Sep 15, 2010 8:12 pm

by lilisanei » Sun Oct 17, 2010 8:53 pm

paes wrote:Mgmat (Page-236) is giving following examples to modify a subgroup :

(i) This model explains all known subatomic particles, some of which were only recently discovered.

(ii) This model explains all known subatomic particles, some of them only recently discovered.

(iii) This model explains all known subatomic particles, some only recently discovered.

Can somebody explain me why 'were' is used for (i) not for (ii)/(iii)

I am looking for the answer too. Can some one explain please.

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Jim@Grockit: GMAT Instructor; Posts: 641; Joined: Wed Jul 22, 2009 3:07 pm; Location: Madison, WI; Thanked: 162 times; Followed by:45 members; GMAT Score:760

by Jim@Grockit » Mon Oct 18, 2010 5:38 am

paes wrote:Mgmat (Page-236) is giving following examples to modify a subgroup :

(i) This model explains all known subatomic particles, some of which were only recently discovered.

(ii) This model explains all known subatomic particles, some of them only recently discovered.

(iii) This model explains all known subatomic particles, some only recently discovered.

Can somebody explain me why 'were' is used for (i) not for (ii)/(iii)

"Which" is a relative pronoun, which generates a relative clause with its own verb (like in this very sentence). The others do not have a relative pronoun.