be動詞

Question

長文の正誤問題の選択肢でこのような文章があるのですが、コンマの後のbe動詞はなぜisになるのでしょうか？
Accurate wind forecasts を共通の主語としてどちらもareになるわけではないんですか？

Accurate wind forecasts are most useful for aircraft takeoffs and landings, but is only a matter of convenience for wind farm operators.

Kevin@MusicoLingo · Answer

The verb should be “are.” The subject is plural. The writer might have chosen “is” because of the singular noun, “a matter,” but it is a mistake.

Accurate wind forecasts are most useful for aircraft takeoffs and landings, but are only a matter of convenience for wind farm operators.

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