推荐回答（1个）
3. 但在引用文献的结论时，用现在时：it was reported that "The sun rises from the east"
5. 同样，得出的那个结论用现在时：we concluded that "it is ture"
总之，别人（自己）做了或者说了的那个行为用过去时，得出的那个结论用现在时。
自己英语也很水，如有不对还请牛人指点。。。;)water3121(站内联系TA)我之前也为这个发愁呢，幸亏这边有高手指教
收到billduke(站内联系TA)英文摘要的时态。英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
一般现在时。用于说明研究目的、叙述研究内容、描述结果、得出结论、提出建议或讨论等。分别举例如下：This study(investigation) is (conducted, undertaken) to…
The anatomy of secondary xylem(次生木质部) in stem of Davidia involucrate (珙桐) and Camptotheca acuminata (喜树) is compared.
The result shows(reveals)…，It is found that…The conclusions are…The author suggests…．涉及到公认事实、自然规律、永恒真理等，当然也要用一般现在时。
一般过去时。用于叙述过去某一时刻(时段)的发现、某一研究过程(实验、观察、调查、医疗等过程)。例如：The heat pulse technique was applied to study the stemstaflow (树干液流) of two main deciduous broadleaved tree species in July and August,1996.
现在完成时和过去完成时。完成时少用，但不是不用。现在完成时把过去发生的或过去已完成的事情与现在联系起来，而过去完成时可用来表示过去某一时间以前已经完成的事情，或在一个过去事情完成之前就已完成的另一过去行为。例如：Concrete has been studied for many years. Man has not yet learned to store the solar energy.leeying(站内联系TA)我也很想知道，每次修改论文的时候，都不知道怎么去修改和确定时态。不知道哪位英文写作丰富的虫友能够做个总结，方便大家提高英语写作水平。angellove3626(站内联系TA)一般都是过去 被动东木3336(站内联系TA)最好用过去时swallowll(站内联系TA)好多高人啊！！！:D:D:Drosyuu111(站内联系TA)英文摘要的时态。英文摘要时态的运用也以简练为佳，常用一般现在时、一般过去时，少用现在完成时、过去完成时，进行时态和其他复合时态基本不用。
一般现在时。用于说明研究目的、叙述研究内容、描述结果、得出结论、提出建议或讨论等。分别举例如下：This study(investigation) is (conducted, undertaken) to…
The anatomy of secondary xylem(次生木质部) in stem of Davidia involucrate (珙桐) and Camptotheca acuminata (喜树) is compared.
The result shows(reveals)…，It is found that…The conclusions are…The author suggests…．涉及到公认事实、自然规律、永恒真理等，当然也要用一般现在时。
一般过去时。用于叙述过去某一时刻(时段)的发现、某一研究过程(实验、观察、调查、医疗等过程)。例如：The heat pulse technique was applied to study the stemstaflow (树干液流) of two main deciduous broadleaved tree species in July and August,1996.
现在完成时和过去完成时。完成时少用，但不是不用。现在完成时把过去发生的或过去已完成的事情与现在联系起来，而过去完成时可用来表示过去某一时间以前已经完成的事情，或在一个过去事情完成之前就已完成的另一过去行为。例如：Concrete has been studied for many years. Man has not yet learned to store the solar energy.richway1222(站内联系TA)还是不明白啊，惠子1985(站内联系TA)就是说你试验的时候就用过去式，在你讨论部分就用现在式和现在完成式，关于introduction部分主要是现在式，其他用到以前的就用过去式tangjia666(站内联系TA)我现在也遇到这了问题，还好，有这么多高手指点！！！！！:D
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