Re: The usage of "which"

Thank you for your explanation.
It seems to be difficult, but I think deeply later. 

--- In EngFor <at> yahoogroups.com, Space <Ann.English <at> ...> wrote:
>
> 
> >
> > --
> >
> > On 12/14/2010 11:00 AM, honeybadger_jp wrote:
> >>
> >>
> >> 1. It is hard to imagine adding 20 metric tons of carbon dioxide
> >> to the atmosphere every year, but that is exactly what an average
> >> American does.
> >>
> 
> ** As Bill said, this sentence is okay.  It contains two shorter 
> sentences, joined by "but".
> I think that the conjunction "but" means "Now my second sentence will 
> make my first sentence weak."  I think two strong sentences stay strong 
> without a "but".  This is an opinion of style.  People will always 
> disagree about style.
> 
> Another problem of style comes from the word "does" pronounced /d^z/.   
>      Does it mean "does imagine adding" or does it mean "does add"?  
> This made-up sentence shows the same problem. "It is hard to imagine 
> Father Christmas visiting every home on Christmas Eve, but that is 
> exactly what an average American does."
> 
> 
> 
> 
> 
> 
> >>
> >> 2. It is hard to imagine adding 20 metric tons of carbon dioxide
> >> to the atmosphere every year, but which is exactly what an average
> >> American does.
> 
> ** As Bill said, we use either "but" or "which".  We can't use both.
> 
> 
> >>
> >>
> On Wednesday, December 15, 2010, at 05:16  AM, Bill Kelly wrote:
> 
> >
> > 3. It is hard to imagine adding 20 metric tons of carbon dioxide
> > to the atmosphere every year, which is exactly what an average
> > American does.
> 
> Sentence 1 in grammar says correctly "ABC is DEF, but PQR is XYZ".  The 
> style problem is not knowing what PQR refers to.
> Sentence 3 in grammar says correctly "ABC is DEF, which is also XYZ."  
> The style problem is the same for me: not knowing what "which" refers 
> to.
> 
> For good style, I suggest
> 
> 4. It is hard to imagine  20 tonnes of carbon dioxide. That is the 
> amount added
> to the atmosphere every year by the average American.
> 
> or
> 
> 5.  The average American adds a certain amount of carbon dioxide to the 
> atmosphere every year.  Twenty tonnes!   It's hard to imagine.
> 
> 
> Regards
> Ann
>

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