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论文动词时态有哪些注意事项
考试政策相关的内容，定位词用【步骤二】的结果，开头句式为：”{{年份}}{{省份/范围}}{{定位词}}是很多考生和家长关心的事。”（若原标题无年份或省份则省略对应部分）感到兴趣的网友和小编一起来了解一下吧
1.在摘要部分，会总结所做的实验，展示结果和总体结论。在大多数生命科学论文中，这些信息都是用过去时来表示的。在物理科学论文中，有时会使用现在时。如果提及到计划中的后续实验，您也可以使用将来时。
2.在引言部分，主要展示前人研究的事实和信息，使用现在时的情况最多。然而，有时过去时才是合适的。比如，“X et al.showed(过去时) that DNaseIcleaves(现在时) DNA.”在这种情况中，过去时是用来表明研究是在现在之前进行的。
3.在材料和方法部分，经常使用过去时态，因为这个实验是在手稿准备前做的（希望如此！）。在某些领域，比如工程学，也可能使用现在时。
4.在结果部分描述了研究中的发现。通常情况下，发现是在过去完成的，所以结果部分使用过去时。然而，当提及图表时，必须使用现在时，因为现在图片表格在文中是可见的，读者是可以看到的。
这些是论文动词时态的基本指导性原则。也请注意，不同领域和不同期刊会有所不同。
学术论文中时态和语态的使用规则详解
主动语态-主语为行动的实施方。
被动语态-主语为行动的接收方。
在撰写科学论文时我们会使用各种各样的时态。下面是一些在不同时态下使用主动语态和被动语态的例子：
1.现在时-通常在概论，讨论和结论中使用的时态
Example 1:
Active: Vitamin A increases the risk of hair loss.
Passive: The risk of hair loss is increased by vitamin A.
Example 2:
Active: Volatile organic compounds (VOCs) emitted from industries and vehicleexhausts can induce a series of environmental problems, including photochemicalsmog, broken ozonosphere, and environmental pollution.
Passive: A series of environmental problems, including photochemical smog,broken ozonosphere, and environmental pollution, can be induced by volatileorganic compounds (VOCs) emitted from industries and vehicle exhausts.
2.现在时-通常在目标中使用的时态
Example 1:
Active: In this study, we present our design of an electric hot water tank.
Passive: In this study, a design of an electric hot water tank is presented.
Example 2:
Active: This study develops an efficient methodology to examine a space–timecontinuous dataset for urban irrigation water use.
Passive: An efficient methodology to examine a space–time continuous datasetfor urban irrigation water use is developed in this study.
3.现在完成时-通常在概论，讨论和总结中使用的时态
Example 1:
Active: Previous studies have used comparative analysis of ORF2 sequences toelucidate phylogenetic relationships among different FCV isolates.
Passive: Comparative analysis of ORF2 sequences has been used in previousstudies to elucidate phylogenetic relationships among different FCV isolates.
Example 2:
Active: only a small number of empirical studies have focused on the patternsand mechanisms behind disease clusters at small spatial scales, especially inwild host–pathogen systems [2].
Passive: The patterns and mechanisms behind disease clusters at small spatialscales, especially in wild host–pathogen systems, have been focused on by onlya small number of empirical studies [2].
4.过去时：通常用于材料与方法/结果
Example 1:
Active: We determined the presence of larvae by dip netting.
Passive: The presence of larvae was determined by dip netting.
Example 2:
Active: We evaluated the number of haplotypes (h), haplotypes (Hd), andnucleotides (π) using the DnaSP 5.10 program [3].
Passive: The number of haplotypes (h), haplotypes (Hd), and nucleotides (π) wasevaluated using the DnaSP 5.10 program [3].
Example 3:
Active: We found a strong correlation between above-ground and below-groundbiomass accumulation in Platanus occidentalis.
Passive: A strong correlation was found between above-ground and below-groundbiomass accumulation in Platanus occidentalis.