作业帮英语完成时态中的标志词或短语有哪些
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英语完成时态中的标志词或短语有哪些
英语完成时态中的标志词或短语有哪些
英语完成时态中的标志词或短语有哪些
现在完成时结构：have/has+过去分词
通常和never ever,just,already,yet,before,once,twice,recently,in the past ten years,for,since,how long连用
过去完成时
常和by the end of last year,by 2008,by last term连用
already , ever , never . so far ,up to now .. since,介词短语或从句。 by + 过去时间用过去完成时。
现在完成时标志词：
already（肯定）, yet（否定，疑问）, just, before, recently,still, lately,never,ever, never, twice, on several occasion,in the past few days/weeks/months/years,(up to)these few days/weeks/months/yea...
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现在完成时标志词：
already（肯定）, yet（否定，疑问）, just, before, recently,still, lately,never,ever, never, twice, on several occasion,in the past few days/weeks/months/years,(up to)these few days/weeks/months/years, this morning/week/month/year, just, up to present, so far,up to now,till now,since+时间
格式：have done
过去完成时：
上面的词+yesterday，last等
格式：had done
将来完成时：
表示某事继续到将来某一时为止一直有的状态。
格式：will have done、will have been done
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already，yet，never，ever，just，so far，至今
for three years ,how long,how many times,three times/twice,since+过去,by+now/today,itis thefist/thirdtime......
in the last few years,in the past few years,...
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already，yet，never，ever，just，so far，至今
for three years ,how long,how many times,three times/twice,since+过去,by+now/today,itis thefist/thirdtime......
in the last few years,in the past few years,in the last ten years,in the past ten years
during the last few years ,during the past few years, during the last ten years ,during the past ten years
over the last few years,over the past few years,over the last ten years ,over the past few years,over the years
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