在科学写作中,下列哪个句子是正确的?
这四个句子都可以改进。“Since”是一个从属连词,意思是与过去的原因/理由或时间有关。在句子(1)中,“since”真正的意思是for the reason that而不是from the time that,所以句子使用逗号和“because”会更清晰:“The scores were not averaged, because we found many outliers.”
句子(2)有歧义。如果“Since”的意思是from the time that,那么动词“study”应该是过去完成时态,以表明studying在过去的某个时间点停止了:“The students said they had not studied since they sat the final examination.”但是,如果“Since”的意思是because,最后一个子句应该用过去完成时来表明原因是一个先前的事件,也应该加上副词“already”:“The students said they did not study, because they had already sat the final examination.”在这句话里,“did not study”暗示not studying是一个新的习惯(相当于“were not studying”)。
注意,修改后的句子(1)和句子(2)中在“because”前面有一个逗号,用来告诉读者不做某个动作的原因。如果没有逗号意思就变成:你在解释你为什么做这个动作,但是否定了一种可能性,读者会期待接下来的真正原因(“The scores were notaveraged because we found many outliers; they were averaged because…”)。
在句子(3)中,“Since”是一个介词,意思是from a specific past time(自从一个具体的过去时间以来)。在这句话里要使用过去完成时:“The teachers last taught in 2000 and had not taught since then.”“Since”也是一个副词,可以表示从某个具体的过去时间到现在,所以另一个修改的选择是“The teachers last taught in 2000 and had not teaching Since.”但是,在特定的时间点之前加上介词可以使句子更加简洁:“The teachers had not taught since 2000.”
句子(4)中没有时间点,只有一个时间段。因此,正确的介词是“for”,需要使用过去完成时态:“The teachers said they had taught for 30 years.”
页面更新:2024-05-02
本站资料均由网友自行发布提供,仅用于学习交流。如有版权问题,请与我联系,QQ:4156828
© CopyRight 2020-2024 All Rights Reserved. Powered By 71396.com 闽ICP备11008920号-4
闽公网安备35020302034903号