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Treid480
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AjiteshArun
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GMAT Focus 1: 715 Q83 V90 DI83
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Treid480
The tidal forces to which an object falling into a black hole is/are subjected is/are sufficient to tear the object apart.

So I started with getting rid of the prepositional phrases.

The tidal forces to which an object falling into a black hole is/are subjected is/are sufficient to tear the object apart.

Now I'm left with, The tidal forces is/are subjected is/are sufficient.
Try the following version:
The tidal forces to which an object falling into a black hole is/are subjected is/are sufficient to tear the object apart.

Clearly, we need the tidal forces are sufficient. We would not say the tidal forces is sufficient.

In the classes that I am forced to attend, the am goes with I, not with classes. Similarly, in the tidal forces to which an object falling into a black hole is subjected, the is goes with an object.

So we end up with the tidal forces to which an object falling into a black hole is subjected are sufficient to tear the object apart.

If you're comfortable using a that to delay the to (don't try this on your GMAT :)), you can try saying this one to yourself:
The tidal forces that an object falling into a black hole is subjected to are sufficient to tear the object apart.
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murarkam
I will pick is and are.
What is subjected to tidal forces? Object
So, tidal forces to which an object is subjected.
What is sufficient? Forces
So, tidal forces to ... Subjected are sufficient to tear the object.

Will wait for expert reply.


Treid480
I would like help understanding the compound verb noun agreement in the example.

Your query has been very well explained above by the Jamboree expert - closing this request.
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