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I read in a web site:

The most obvious evidence that these languages are related is similarities in many items of vocabulary.

And I wonder whether one can also say as follows, putting the copula in plural form to make it agree with the noun 'similarities' that follows it:

The most obvious evidence that these languages are related are similarities in many items of vocabulary.

How do you, native speakers of English, think of this?
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Hi guys,

Yes. I think a native speaker will often avoid this kind of awkwardness by wording the thought in another way, eg

The most obvious evidence that these languages are related is that there are similarities in many items of vocabulary. (I'd just say 'words')

Best wishes, Clive
Comments  
Siki I read in a web site:

The most obvious evidence that these languages are related is similarities in many items of vocabulary.

And I wonder whether one can also say as follows, putting the copula in plural form to make it agree with the noun 'similarities' that follows it:

The most obvious evidence that these languages are related are similarities in many items of vocabulary.

How do you, native speakers of English, think of this?

Siki,

'evidence' is a non-countable noun. If you rephrase the sentence, you many understand it better.

The most obvious evidence includes similarities in many items....

pine
 Clive's reply was promoted to an answer.