yesterday有两个词性,一个是名词,一个是副词.
一般习惯用其副词词性,如
I went to school yesterday.注意这里yesterday是副词词性,用来修饰动作went,因而前面不加介词.
试区别I went to school on Tuesday.Tuesday这里是名词词性,因而要加上介词on,组合起来表时间状语
此外yesterday用作名词时通常放在句首,如
Yesterday was a rainy day.
Yesterday once more.
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