manyabrightideashasbeenhituponbychanceideas是可数名词单数吗?为什么有这样的例句呢

Question

many a bright ideas has been hit upon by chance
ideas是可数名词单数吗?为什么有这样的例句呢

Answer 1

你的句子应该是
many a bright idea（没有s) has been hit upon by chance
许多聪明的想法是偶然冒出来的.
many a + n(单数)意思上就同many +n-s,一般常用于散文,诗歌中了.但是,many a 后面接的是单数可数名词.有时还可能含有“一个又一个的……”的意思.
Many a student has come to know the difficulty.= Many students have come to know the difficulty.