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sejpdw
Joined: 26 Oct 2005
Posts: 217
Location: Korea
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 Posted: Fri Nov 04, 2005 12:20 am Post subject: has occurred |
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If minerals in the rock interact with dissolved salts present in water to form a new mineral, a chemical change has occurred.
I think 'occurs' is the better choice.
I'm wondering if 'occurs' can be used and the reason 'has occurred' was used. |
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doliver
Joined: 09 Oct 2005
Posts: 36
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| Posted: Fri Nov 04, 2005 4:12 am Post subject: |
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Hello, Sejpdw:
You wrote:
| Quote: |
If minerals in the rock interact with dissolved salts present in water to form a new mineral, a chemical change has occurred.
I think 'occurs' is the better choice.
I'm wondering if 'occurs' can be used and the reason 'has occurred' was used. |
Comments:
I can't think of any reason to use has occurred in the sentence that you quoted. I agree with you that occurs is a better choice. In fact, using has occurred makes no sense to me.
Best wishes�
D. Oliver
_________________
Dennis Oliver
Estrella Mountain Community College
Avondale, AZ U.S.A.
http://www.emc.maricopa.edu |
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haoren
Joined: 01 Nov 2005
Posts: 48
Location: china
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| Posted: Sun Nov 06, 2005 5:22 pm Post subject: |
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comments:
occurs is better,because the chmemical change is a fact.can you understand me? i think,the expression that* the chmemical change is a fact*is not right. |
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kurisuti
Joined: 26 Jan 2005
Posts: 55
Location: USA
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| Posted: Sun Nov 06, 2005 6:15 pm Post subject: |
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If minerals in the rock interact with dissolved salts present in water to form a new mineral, a chemical change has occurred.
Since the salts & minerals have already formed a new mineral when you see it, the event already "has occured." It is not still occuring when you look at the rock, because the new mineral is done being made.
You would use "occurs" if the sentence was this:
When minerals in the rock interact with dissolved salts, a chemical change occurs. |
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haoren
Joined: 01 Nov 2005
Posts: 48
Location: china
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| Posted: Mon Nov 07, 2005 5:12 am Post subject: |
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kurisuti.thanks for your help.
have a nice day!! |
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kurisuti
Joined: 26 Jan 2005
Posts: 55
Location: USA
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| Posted: Mon Nov 07, 2005 9:29 am Post subject: |
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| Sure thing, you too! Please post again if you have any more questions, ok? |
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