8 大时态结构一、一般现在时1、概念：表示经常发生的情况；有规律出现的情况；总是发生的；事实真理。2.时间状语: Always, usually, often, sometimes, every week (day, year, month…), once a week (day, year, month…), on Sundays (on Mondays…), etc.3.基本结构：主语+动词原形（如主语为第三人称单数，动词上要改为第三人称单数形式）4.否定形式：主语+am / is / are+not+其他；此时态的谓语动词若为行为动词，则在其前加 don't，如主语为第三人称单数，则用 doesn't，同时还原行为动词。5.一般疑问句：把 be 动词放于句首；用助动词 do 提问，如主语为第三人称单数，则用 does，同时，还原行为动词。eg ： ① It seldom snows here. 这 里 很 少 下 雪 。 ② He is always ready to help others. 他 总 是 乐 于 帮 助 别 人 。 ③ Action speaks louder than words. 事实胜雄辩。二、一般过去时1.概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为。2.时间状语：ago, yesterday, the day before yesterday, last week, last (year,night,month…), in 1989, just now, at the age of 5, one day, long long ago, once upon a time,etc.3.基本结构：主语+动词的过去式或 be 的过去式+名词4.否定形式：主语+was / were+not+其他；在行为动词前加 didn't，同时还原行为动词。5.一般疑问句：was 或 were 放于句首；用助动词 do 的过去式 did 提问，同时还原行为动词。eg：① She often came to help us in those days.那些天她经常来帮助我们。② I didn't know you were so busy.我不知道你这么忙。三、一般将来时1.概念：表示将要发生的动作或存在的状态及打算、计划或准备做某事。2.时间状语：Tomorrow, next day (week,month, year…), soon, in a few minutes, by…, the day after tomorrow,etc.3.基本结构 ：主语+am/is / are+going to+do+ 其它；主语 +will / shall+do+其它4.否定形式：主语+am /is/ are not going to+do；主语+will / shall not do+其它5.一般疑问句：be 放于句首；will / shall 提到句首。（首字母大写）eg：① They are going to have a competition with us in studies.他们将在学习中与我们竞争。② It...
