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新概念二 时态问题第28课 but none of them has been turned to stone yet!

来源：学生作业帮 编辑：神马作文网作业帮 分类：英语作业 时间：2024/11/10 17:37:10
新概念二 时态问题
第28课 but none of them has been turned to stone yet!这句话是现在完成,不明白has been后面能加turned吗?他不是动词吗?
第二个问题,如果主句用的是现在完成时,前面的状语从句中的动词要用什么时态?
新概念二 时态问题第28课 but none of them has been turned to stone yet!
如你所说,turn是动词,而且属于瞬间动词.现在完成时特别强调瞬间动词和持续性动词.瞬间动词表示短暂、不能持续一段时间的动作,如come,go,leave,start,begin,become,receive,die,而持续性动词表示能持续一段时间的动作,如work,stay,live,learn等.
但是,瞬间动词的肯定结构可以用不与“for+时间段”连用的现在完成时,说明某个动作已经发生；瞬间动词的否定结构可以与“for+时间段”连用,说明某动作不发生的状态可以持续一段时间.
句型It is/has been + 时间段 + since(从句的谓语动词用一般过去时)例如：It is ten years since his father died.他父亲去世有十年了
句型this is the first/ second/ third … time that(从句的谓语动词用现在完成时)例如：This is the second time that the products of our company have been shown in the International Exhibition.这是我公司产品第二次参加国际展览会
在时间状语从句中,谓语动词可以用现在完成时代替将来完成时.例如：Mother won’t let her watch TV until she has finished her homework.母亲要到她做完作业才让她看电视
希望我的回答能帮你弄明白现在完成时,
新概念二 时态问题第28课 but none of them has been turned to stone yet! But none of them has been turned to stone yet这句话中为什么用has? But none of them has been turned to stone yet!这句话里none of在这里 but none of them has been turned to stone yet.翻译出到目前为止是因为完成时 --------of them has been turned to stone yet.这是新概念英语2里的一个课后题 None of them has come back yet.与None of them have come back I have been to many hotel but none of them can ( )this one f -___ these books ___well?-No,none of them has sold out yet. jenny promised to come early but she has not（ turned up ）yet "One of them has __engineer."中为什么要填turned而不是been、become、got i have a lot of friends ,but none of _ has ever been abroad. "but none of them has your smile on the twinkle in your eyes