whatreallycountonisnotquantitybutquality.这句话count为什么不加s?

Question

what really count on is not quantity but quality.这句话count为什么不加s?

Answer 1

what是代主语,这句话真正的主语是not quantity but quality（不是数量而是质量）
所以这句的如果转换一下语序,就是 quality is what really count on,but not quantity.
it is quality ,not quantity,really count on.
所以,count的主语是“质量而不是数量" 这个词组.所以,不加s?
好吧.我自己说着说着也糊涂了.