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bmwhype2
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comparisons - synthetic oils 14 Jun 2007, 07:00
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Synthetic oils burn less efficiently than natural oils.

The question is wrong because we are trying to compare how well each oil burns and not the oils themselves.

How should this question be revised?



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comparisons - synthetic oils 14 Jun 2007, 08:51
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Synthetic oils burn less efficiently than natural oils do.

or if its a question then
Do synthetic oils burn less efficiently than natural oils.
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comparisons - synthetic oils 14 Jun 2007, 10:00
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dips
Synthetic oils burn less efficiently than natural oils do.

or if its a question then
Do synthetic oils burn less efficiently than natural oils.
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is this what the sentence implies?


Synthetic oils burn less efficiently than natural oils do (burn).
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bmwhype2
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comparisons - synthetic oils 27 Jun 2007, 08:09
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Synthetic oils burn less efficiently than do natural oils.

What exactly is the do replacing/referring to? I've seen this comparison example so many times and have never quite figured it out.
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comparisons - synthetic oils 05 Jul 2007, 13:10
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bmwhype2
Synthetic oils burn less efficiently than do natural oils.

What exactly is the do replacing/referring to? I've seen this comparison example so many times and have never quite figured it out.
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Okay. I figured it out.

Do replaces action verbs (not linking or modal verbs).

I run faster than she does.
I run faster than she runs.
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comparisons - synthetic oils 05 Jul 2007, 13:30
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She has more skirts than I do.
Here, has is the action verb. Do replaces the action verb.

She has gone home before I have.
We can omit do and repeat the auxiliary verb has. The action verb is gone.



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