is best left unsaid,best是做副词吗?

is best left unsaid,best是做副词吗? something are best left unsaid or unknown 这句话的意思? 里面的best分别是做形容词还是副词? she is probably the best singer里面的副词probably 是修饰the best sin something is better left unsaid是什么意思···? 副词best的用法 Perhaps the last word is best left to his father. 在英语中 he runs fastest.she studies best.里面的副词最高级fastest,best 是 The best is yet to come.请问为什么加to呢?yet是副词吗?他是修饰be动词?还是修饰come的 best Whose is the best?是主系表结构吗?表语是? whic is the best answer?主语是?