Hi Anon I'd use "was a realist" in your first sentence, and in your second sentence I'd use "were qualified". I think I'd follow the same sort of rule we use for "or" in this case: the use of the singular or plural form of the verb is determined by the noun closest to the verb. What your sentences mean are: - Kosaka was a realist, and so was Sakamoto.
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Anonymous"not only Kosaka but also Sakamoto were realists"?Not good. I would say:
Cool BreezeMy sentiments exactly, CB.Anonymous"not only Kosaka but also Sakamoto were realists"?Not good.