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However, although the general rule is to add es to the name it becomes somewhat cumbersome with some names. For example, it looks most awkward if you said there were two Culbertsonses at the meeting, or two Edwardses, or two Bateses.
But it is much better to rearrange the sentence to say there were two people called Jones at the meeting (Two people called Culbertsons, two people called Edwards, two people called Bates, and so on.)
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