what (are/is)good manners (are/is)not always the same in different countries应该添哪个,为什么?
问题描述：
what (are/is)good manners (are/is)not always the same in different countries
应该添哪个,为什么?
答
are is
manners是复数形式，所以可知前面的空要填are
what (are good manners)中what 是中心词，是单数，所以后面的空要填is
答
are
is
答
are,is
第一个句子的主语是good manners,因此用are,相对于整个句子来说,what are good manners作主语看作单数,选择is.