中学英语课本中出现了很多作状语的时间短语,有的前面加介词,有的不加介词,对此许多同学常常迷惑不清。下面我想就常见的前面不加介词的几种情况加以归纳,希望对读者有所帮助。 There are many adverbial time phrases in secondary school English textbooks, some with prepositions and some without prepositions. Many students are often confused. Below I would like to generalize several situations that do not include prepositions before. I hope to help readers.