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

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ihavelearneditsincethreeyearsago.这里since做介词?threeyearsago不是副词吗?很疑惑如果是forthreeyears.这里threeyears是名词?另

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...

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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

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