i have learned it since three years ago.这里since做介词?three years ago不是副词吗?很疑惑 如果是for three years.这里 three years是名词?另问一个问题 young sister和younger sister有什么区别?可以用young sister 表达
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 15:19:34
![i have learned it since three years ago.这里since做介词?three years ago不是副词吗?很疑惑 如果是for three years.这里 three years是名词?另问一个问题 young sister和younger sister有什么区别?可以用young sister 表达](/uploads/image/z/8998004-20-4.jpg?t=i+have+learned+it+since+three+years+ago.%E8%BF%99%E9%87%8Csince%E5%81%9A%E4%BB%8B%E8%AF%8D%3Fthree+years+ago%E4%B8%8D%E6%98%AF%E5%89%AF%E8%AF%8D%E5%90%97%3F%E5%BE%88%E7%96%91%E6%83%91+%E5%A6%82%E6%9E%9C%E6%98%AFfor+three+years.%E8%BF%99%E9%87%8C+three+years%E6%98%AF%E5%90%8D%E8%AF%8D%3F%E5%8F%A6%E9%97%AE%E4%B8%80%E4%B8%AA%E9%97%AE%E9%A2%98+young+sister%E5%92%8Cyounger+sister%E6%9C%89%E4%BB%80%E4%B9%88%E5%8C%BA%E5%88%AB%EF%BC%9F%E5%8F%AF%E4%BB%A5%E7%94%A8young+sister+%E8%A1%A8%E8%BE%BE)
i have learned it since three years ago.这里since做介词?three years ago不是副词吗?很疑惑 如果是for three years.这里 three years是名词?另问一个问题 young sister和younger sister有什么区别?可以用young sister 表达
i have learned it since three years ago.这里since做介词?three years ago不是副词吗?
很疑惑 如果是for three years.这里 three years是名词?
另问一个问题 young sister和younger sister有什么区别?可以用young sister 表达妹妹吗?
抱歉再补充一句,那since作介词的话后面跟名词,那时间名词是怎样?怎么区分时间名词还是时间副词?
i have learned it since three years ago.这里since做介词?three years ago不是副词吗?很疑惑 如果是for three years.这里 three years是名词?另问一个问题 young sister和younger sister有什么区别?可以用young sister 表达
这里的since是连接词
conj.(连接词)
During the period subsequent to the time when:
在…以后的一段时间里:
He hasn't been home since he graduated.
他毕业后没回过家
Continuously from the time when:
从…时起一直:
They have been friends ever since they were in grade school.
他们从小学起就一直是好朋友
three years ago 是时间状语
妹妹一般是younger sister
姐姐 elder sister
只说sister 表示姐妹 既可以是姐姐也可以是妹妹
since 的用法参照一下解释:
1.作为连词的since, 其意义有两个:
1) after the last time when…自从…以来,以后
2) continuously from the last time when…从…以后,就一直…
这是我们需要弄明白的第二个疑惑点。
2.在since引导的状语从句...
全部展开
since 的用法参照一下解释:
1.作为连词的since, 其意义有两个:
1) after the last time when…自从…以来,以后
2) continuously from the last time when…从…以后,就一直…
这是我们需要弄明白的第二个疑惑点。
2.在since引导的状语从句,其谓语可以是一般过去时,也可以是现在完成时。但,其谓语动词是短暂动词还是延续动词或状态动词,其表达的意思就完全不一样了。
这是正确理解since从句的关键。
3.Since从句中的谓语动词是短暂性动词:用一般过去时或现在完成时,意义一样,都表示过去时间的起点:
It is three years since I saw Bill.
It has been three years since I saw Bill.
It is three years since I have seen Bill.
句意是:从我那时看见Bill到现在已经三年了。
4.Since 从句中的谓语动词是延续性动词或状态动词,过去时态表示动作或状态的结束,现在完成时表示动作或状态的开始并延续至今:
I haven’t heard from him since he lived in London.
(他已不在London,从他离开London之时起到现在我就没有收到过他的来信)
I haven’t heard from him since he has lived in London.
(他还在London,从他搬到London起到现在我就没有收到过他的来信)
They have had three headmasters since I was at this school.
(我已不在这所学校,从我离开这所学校他们已经换了三位校长)
They have had three headmasters since I have been at this school.
(我还在这所学校,从我到这所学校起他们已经换了三位校长)
It has been three years since he lived here.(他不在这儿住了,已经三年了。)
可以用young sister 表达妹妹
收起