Some people think that the islanders used large strong wooden tools,but there is notenough evidence to prove.这个句子是什么句,为什么but前面要加逗号呢?它不是连词吗?

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Somepeoplethinkthattheislandersusedlargestrongwoodentools,butthereisnotenoughevidencetoprove.这个句子是什么

Some people think that the islanders used large strong wooden tools,but there is notenough evidence to prove.这个句子是什么句,为什么but前面要加逗号呢?它不是连词吗?
Some people think that the islanders used large strong wooden tools,but there is not
enough evidence to prove.这个句子是什么句,为什么but前面要加逗号呢?它不是连词吗?

Some people think that the islanders used large strong wooden tools,but there is notenough evidence to prove.这个句子是什么句,为什么but前面要加逗号呢?它不是连词吗?
普通陈述句,but前加逗号,是因为前一句语意完整,而后一句转折陈述.

Some people think that the islanders used large strong wooden tools, but所以在agree的后面就不需要加this了 及物和不及物的区别。

有些人认为岛上居民使用又大又硬的木头工具,但事实并非如此。