oneday与someday的区别不是在于oneday可以用于过去时和将来时,而someday只可用于一般过去时吗?既然oneday既可以用于过去是,又可用于将来时,那么一切都用oneday不就行了吗?为什么还要用som

Question

one day 与some day 的区别不是在于one day 可以用于过去时和将来时,而some day 只可用于一般过去时吗?
既然oneday 既可以用于过去是,又可用于将来时 ,那么一切都用one day 不就行了吗?为什么还要用some day
[[[他们之间还有其他区别吗?]]].我问的是不是太多了,很抱歉.

Answer 1

一、一般现在时：
概念：经常、反复发生的动作或行为及现在的某种状况.
时间状语： always, usually, often, sometimes, every week (day, year, month…), once a week, etc.
基本结构：①be动词；②行为动词
否定形式：①am/is/are+not;②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.
一般疑问句：①把be动词放于句首；②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.
二、一般过去时：
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.
时间状语：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.
基本结构：①be动词；②行为动词
否定形式：①was/were+not;②在行为动词前加didn't,同时还原行为动词.
一般疑问句：①was或were放于句首；②用助动词do的过去式did 提问,同时还原行为动词.
三、现在进行时：
概念：表示现阶段或说话时正在进行的动作及行为.
时间状语：now, at this time, these days, etc.
基本结构：am/is/are+doing
否定形式：am/is/are+not+doing.
一般疑问句：把be动词放于句首.
四、过去进行时：
概念：表示过去某段时间或某一时刻正在发生或进行的行为或动作.
时间状语：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.
基本结构：was/were+doing
否定形式：was/were + not + doing.
一般疑问句：把was或were放于句首.
五、现在完成时：
概念：过去发生或已经完成的动作对现在造成的影响或结果,或从过去已经开始,持续到现在的动作或状态.
时间状语：recently, lately, since…for…,in the past few years, etc.
基本结构：have/has + done
否定形式：have/has + not +done.
一般疑问句：have或has.
六、过去完成时：
概念：以过去某个时间为标准,在此以前发生的动作或行为,或在过去某动作之前完成的行为,即“过去的过去”.
时间状语：before, by the end of last year(term, month…),etc.
基本结构：had + done.
否定形式：had + not + done.
一般疑问句：had放于句首.
七、一般将来时：
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.
时间状语：tomorrow, next day(week, month, year…),soon, in a few minutes, by…,the day after tomorrow, etc.
基本结构：①am/is/are/going to + do；②will/shall + do.
否定形式：①was/were + not; ②在行为动词前加didn't,同时还原行为动词.
一般疑问句：①be放于句首；②will/shall提到句首.
八、过去将来时：
概念：立足于过去某一时刻,从过去看将来,常用于宾语从句中.
时间状语：the next day(morning, year…),the following month(week…),etc.
基本结构：①was/were/going to + do；②would/should + do.
否定形式：①was/were/not + going to + do;②would/should + not + do.
一般疑问句：①was或were放于句首；②would/shou
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