". Even So, leaving complex correctness aside, I do think regular usage allows for your query in each sorts, and I might ignore your grammar checker if I were you. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Hence 'are either of you free?'must always be proper. Nevertheless 'Is either Peter or Paul free?'will be https://pornx.cam/