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ex) You can see the holes in skulls found by scholars have partially repaired themselves


Q. Can 'have+past participle(have repaired)' be placed at that position in the sentence above?

Q. What is the difference between these sentences?

ex1) You can see the holes in skulls found by scholars have partially repaired themselves

ex2) You can see the holes in skulls found by scholars partially repair themselves

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ex) You can see the holes in skulls found by scholars have partially repaired themselves

Q. Can 'have+past participle(have repaired)' be placed at that position in the sentence above? Yes. Think of the sentence this way. You can see the holes in skulls, which were found by scholars, have partially repaired themselves.

Q. What is the difference between these sentences?

ex1) You can see the holes in skulls found by scholars have partially repaired themselves. The holes did this in the past

ex2) You can see the holes in skulls found by scholars partially repair themselves. The holes do this all the time, ie past/present/future.

Clive

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Those sentences do not make sense.
Bones do not repair themselves. They heal. The break in the bone is naturally repaired by the healing process.

You can see the holes in skulls found by scholars that had partially healed over.

The skulls had been trepanned.

https://www.mentalfloss.com/article/70309/trepanation-history-one-worlds-oldest-surgeries

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HoonyYou can see the holes in skulls found by scholars

This sounds like a complete sentence.

Hoonythe holes in skulls found by scholars have partially repaired themselves

And this sounds like a complete sentence.


To avoid confusion for the reader, add 'that': You can see that the holes ...

(The same is true for your second sentence.)

CJ

Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
AlpheccaStarsBones do not repair themselves. They heal.

That's a good point. Heal is the logical word regarding recovering from wounds.