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“你问我答”：“None of them are…” 这类句型的用法
一位听众想知道 “all of them are not…”、“some of them are not…” 和 “none of them are…” 之间的区别。虽然这三个句型都包含否定词 “not” 或 “none”，但它们当中有的是全部否定，有的是部分否定。本期节目以 “None/some/not all of the shops are open.” 为例，辨析这三个句型的用法。