after since when 用法it's three years ___i saw him last time.应选哪个?为什么?谢大侠了!如果用SINCE是不是主句应该用完成时态呢？如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。再谢过各位大侠！It seemed only s

after since when 用法it's three years ___i saw him last time.应选哪个?为什么?谢大侠了!如果用SINCE是不是主句应该用完成时态呢？如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。再谢过各位大侠！It seemed only s
after since when 用法
it's three years ___i saw him last time.
应选哪个?为什么?谢大侠了!
如果用SINCE是不是主句应该用完成时态呢？
如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。
再谢过各位大侠！
It seemed only severval minutes___ he finished this painting.
a.after b.before c.when d.until
如大侠 cglzhxy所说，这一题是不是该选A呢？

after since when 用法it's three years ___i saw him last time.应选哪个?为什么?谢大侠了!如果用SINCE是不是主句应该用完成时态呢？如IT HAS BEEN THREE YEARS SINCE I SAW HIM LAST TIME。再谢过各位大侠！It seemed only s
这里应该用 since 翻译:我已经三年没有见过他了
eg:
It's been years since I enjoyed myself so much as last night.我已有好多年没有像昨晚那么痛快了.
It has been +一段时间+ since sth.happened.是一个很有用的句型.现在常写作：
It is +一段时间+since sth.happened
副词 adv.什么时候,何时
at what time
· When can you come to see me?
你什么时候来看我?
· When did you go to bed last night?
昨晚你什么时候睡觉的?
· When are you going to return it?
你准备什么时候还（书）?
副词 adv.是…时候
at which;on which
· Please tell me when we'll have the meeting.
请告诉我我们什么时候开会.
· I wonder when that was.
我不知道那是什么时候的事.
副词 adv.在…的时候
at or during which
· How I regretted the days when I had played and should have studied!
我多么懊悔我本该好好学习却玩掉了的那么多的日子!
副词 adv.那时
but at that moment
· It happened on a day in November when the weather was very wet and cold.
这事发生在十一月的一天,那时天气又潮湿又寒冷.
· We were about to start,when it began to rain.
我们刚要出发时开始下雨了.
连词 conj.当…时
at the time when
· It happened when I was living in the country.
这事发生在我住在农村的时候.
· It was raining when we arrived.
我们到达时,天正下着雨.
· He always comes on those days when I am busy.
他总在我忙的日子来.
· I was walking along the stream,when I met my teacher of English.
当我沿着小溪散步时遇到了英语老师.
连词 conj.一…就
immediately after
· When I had finished dinner I went to bed.
我吃完饭就睡觉了.
· She was very surprised when she saw me.
她见到我非常惊讶.
· Let us set out when the sun has risen.
太阳一出来,我们就动身.
代词 pron.（关系代词）那时
which time
· I came here in 1949,since when I have been engaged in this work.
我1949年到这里,从那时起我就担任这项工作.
· We came a week ago,since when the weather has been bad.
我们在一星期前来此,从那时起天气就一直不好.
代词 pron.（疑问代词）什么时候
what time
· Since when have you been here?
你从何时起在此地?
· Until when can you stay?
你能呆到什么时候?
一般说来,如果在过去某一时间内先后发生了两个动作,那么先发生的动作用过去完成时,后发生的动作用一般过去时.但是若用连词after 来连接这两个动作,由于after本身已说明了两个动作的先后关系,所以两者均可用一般过去时.
问题：It seemed only severval minutes___ he finished this painting.
a.after b.before c.when d.until
你的回答不对,应该是它表示好象没过几分钟他就完成了这幅绘画作品.
It +be +time before ------
你也要具体问题具体分析,不能生搬硬套,那样行不通!加油吧!

since 翻译为 我三年没有见过他了，since的意思就是自从 when一般引导时间状语从句，after是“...之后”的意思

since . since 有自从的意思

since
自从我上次看到他以来已是三年了