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一般是指过去时。其它还有：one morning, one afternoon, one evening, one night。再有：once upon a time ,there was once。  一、一般现在时： 标志：always, usually, often, sometimes, every week (day, year, month...), once a week, on Sundays, 结构：①be动词；②行为动词 二、一般过去时： 标志：ago, yesterday, the day before yesterday, last week(year, night, month...), in 1989, just now, at the age of 5, one day, long long ago, once upon a time, etc. 结构：①be动词；②行为动词 三、现在进行时： 标志：now, at this time, these days, etc. 结构：am/is/are+doing 四、过去进行时： 标志：at this time yesterday, at that time或以when引导的谓语动词是一般过去时的时间状语等。 结构：was/were+doing 五、现在完成时： 标志：recently, lately, since...for...,in the past few years, etc. 结构：have/has + done 六、过去完成时 标志：before,by,the end of last year(term,month)...... 结构：had done 七、一般将来 标志：tomorrow,next day,soon,in a few minutes.... 结构：1、be going to 2、will/shall do 八、过去将来时 标志：the next day,the following month 结构：1、be going to do 2、would /should do 这里列举的都是最基本的，具体题型中还有很多变化。 (责任编辑：admin) |