> 人口が増える [ に伴い／とともに ] 周辺もにぎやかになってきた。  
>  Jinkou ga fueru (ni tomonai/to tomo ni) shuuhen mo nigiyaka ni natte kita

Both the options seem grammatically correct. What's the difference then? Or do
I understand it wrong?
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2014-10-01T02:03:30.957
18882
2014-10-01T03:55:44.033
2014-10-01T02:43:25.523
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question
grammar
Expressing concurrency
AFAIK, they are nearly identical and interchangeable. One of my grammar books
has the exact same wording for both structures.

> _～すると、それと一緒に_  
>  動詞の辞書形／名詞 ＋ {に伴って・とともに}

参照: [Proportion and Rate](https://japanese.stackexchange.com/q/2528/78)
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2014-10-01T03:55:44.033
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2014-10-01T03:55:44.033
2017-04-13T12:43:44.397
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78
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answer