[文法] Be動詞的前後單複數是否可以不同?

[pavlov (海風)]

英文書給的答案上寫:

My friends and I are really keen on playing computer games.
They are a really good way to spend an evening.

單複數在文法上不是應該要一致嗎?
還是這是某種例外?a really good way其實當作不可數的片語?

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→ Soulchild:這邊是把computer games視為"一個整體(as a whole)"
推 GlobeTrekker:可以的，例如A and B are a perfect match.