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25 Apr 2009, 09:47
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Hi, i think we all know the following
I have lived in Moscow for eight years. (still live in Moscow)
I had lived in Moscow for eight years, before I moved to New York. (No longer live in Moscow)
But, i got confused when I try to apply present/past pefect in following cases:
All y chromosome in existence today are descended from y chromosome of a single ancestor who is thought to have lived about 150,000 years ago (O)
All y chromosome in existence today are descended from y chromosome of a single ancestor who is thought to had lived about 150,000 years ago (X)
Since a present perfect is used when an action is continuing from the past to present, the anscestor in this case obviously no longer live till present, so my first thought was it has to be past perfect, 'had lived'.
What is wrong with my approach on present perfect in this case?
Then, for past perfect, it must indicate the action is completed before another action in the past, but since there is no other past in this sentense to indicate the action is completed before another past, we should just use a simple past as follow:
All y chromosome in existence today are descended from y chromosome of a single ancestor who lived about 150,000 years ago (Is this wrong?)
Please help and thank you in advance.
Thank you in advance.
I have lived in Moscow for eight years. (still live in Moscow)
I had lived in Moscow for eight years, before I moved to New York. (No longer live in Moscow)
But, i got confused when I try to apply present/past pefect in following cases:
All y chromosome in existence today are descended from y chromosome of a single ancestor who is thought to have lived about 150,000 years ago (O)
All y chromosome in existence today are descended from y chromosome of a single ancestor who is thought to had lived about 150,000 years ago (X)
Since a present perfect is used when an action is continuing from the past to present, the anscestor in this case obviously no longer live till present, so my first thought was it has to be past perfect, 'had lived'.
What is wrong with my approach on present perfect in this case?
Then, for past perfect, it must indicate the action is completed before another action in the past, but since there is no other past in this sentense to indicate the action is completed before another past, we should just use a simple past as follow:
All y chromosome in existence today are descended from y chromosome of a single ancestor who lived about 150,000 years ago (Is this wrong?)
Please help and thank you in advance.
Thank you in advance.
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Hi there,
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26 Apr 2009, 13:41
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Most common ways to join the past event with present are:
1) using TO: Dinosaurs are believed to have lived mln years ago = Combination of a) People believe & b) Dinosaurs lived mln years ago.
2) using THAT, AS IF & so on: People believe that dinosaurs lived mln years ago. People believe that dinosaurs had lived before ice age began. But never: Dinosaurs are believed to had lived ....
If you still have difficulty deciding To have V3 or To Had V3, then simple rule is " After infinitive never V3 (past) but V1.
V3 - past participle of verb ( 3 rd form)
I hope it helps, sorry, I was not good at explaining shortly
1) using TO: Dinosaurs are believed to have lived mln years ago = Combination of a) People believe & b) Dinosaurs lived mln years ago.
2) using THAT, AS IF & so on: People believe that dinosaurs lived mln years ago. People believe that dinosaurs had lived before ice age began. But never: Dinosaurs are believed to had lived ....
If you still have difficulty deciding To have V3 or To Had V3, then simple rule is " After infinitive never V3 (past) but V1.
V3 - past participle of verb ( 3 rd form)
I hope it helps, sorry, I was not good at explaining shortly
26 Mar 2020, 06:10
Kudos
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Automated notice from GMAT Club VerbalBot:
A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
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A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
This post was generated automatically.
