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I found the following sentence on BBC. What I cannot understand is the usage of "but also" without "not only". Therefore, I would really appreciate it if someone could let me know why they do not use "not only" in the following sentence.


Suspecting that this ratio would depend on local conditions, the researchers looked at northern China, which has seen intensive tree planting by the government because of climate change but also in an effort to reduce dust from the Gobi desert.


Reference :-

https://www.bbc.com/news/science-environment-53138178

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dileepaWhat I cannot understand is the usage of "but also" without "not only".

"not only ... but also ..." forms an idiomatic unit, but that doesn't mean the four words 'not', 'only', 'but', and 'also' cannot be used separately, or even that 'not only' and 'but also' cannot be used separately. The idiom itself is often shortened to "not only ... but".

Public spending needs to be cut, but also redirected to infrastructure projects.
The students see what's possible to achieve but also that not everyone makes it.
Our work environment is fast-paced and challenging, but also extremely exciting.

Not only do students respect their teachers, we form close bonds with them, too.
That has begun to change — and not only because of economic turmoil in the south.
The PKK has also committed terrorist atrocities, especially but not only in the south-east.

CJ

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I'd say you have found an example of careless or sloppy writing.

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dileepaWhat I cannot understand is the usage of "but also" without "not only".

That is not unusual, and it is not the problem here. That sentence is a quote from a non-native speaker talking extemporaneously. He probably employed a model from his native language, I suspect Flemish. That "but" is misleading. "And" is more like it.

I've been trying to answer this for days. Something made the page churn.

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anonymousI've been trying to answer this for days. Something made the page churn.

There is a bug in the system. This happens sporadically when the header contains quotation marks. One of our forum members was able to put spaces before the closing quotes, and that fixed the problem.

CJ

Thank you very much for the answer.