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如:We’ll be back in three days. After seven the rain began to fall. What shall we do after graduation? After two months he returned. 注意:after 有時也可以表示在一段時間之后(常用在過去時里) 表示地理位置的 in, on, to:in 表示在某范圍內(nèi),on 指與什么毗鄰,to 指在某環(huán)境范圍之外 如:Changchun is in the northeast of China./ Mongolia is on the north of China./ Japan is tothe east of China. 表示“在……上”的 on 和 in:on 只表示在某物的表面上,而用 in 表示占去某物一部分,表示……上。一般多與現(xiàn)在時、過去時、將來時連用?! n 總是跟日子有關(guān),on Monday, on Christmas morning, on the following, on May Day, on a warm morning 等?! t 如:常用詞組有: at noon, at night 表示時間的 at, in, on:表示片刻的時間,at 8 o’clock,at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year 等。since用于指從過去特定的某個時刻到說話時為止的一段時間?! ∪纾篴t six o’clock, at Easter (4) over, through (out)兩者均指“經(jīng)過的全部時間”?! ∪纾?in July/summer/2000/ancient times The bus will be here in ten minutes. (2) on表示“在特定的某一天”,也可用于帶有修飾語的一天的某個時間段之前。They started the machine by pre