>>Hi everyone,
>>
>>I have a little bit of a problem today with my English grammar. In an article I'm proof-reading I see word series used as a single, e.g. with "a" article or with "this" article. I think, it should be changed to "the" and "these", but I started to feel uncertain about it.
>>
>>Would somebody please resolve this issue for me?
>>
>>Thanks a lot in advance.
>
>According to www.dictionary.com, this word seems to be both singular and plural - and that is the way I have used it in the past, too.
>
>Also, the Oxford American Dictionary says that the plural of series is series.
>
>HTH,
>
>Hilmar.

Thanks, Hilmar. I don't know, why I was so confused today. Ok, it would be quite interesting to find similar words in English, where the single and plural forms are the same. And also if the word is in plural, but used as a single.

What are your examples?

Thanks.