Generally speaking, if it is a chapter in a paper, the past tense is usually used, such as Jonesfoundthat, but literature review may also use multiple tenses. Here are some techniques for judging tenses.
1, past tense.
If you are mainly talking about the research itself or who did the research, you'd better use the past tense. At this time, the theme of the study is this sentence: Jones reported. The past tense is the most common tense, also known as the "reporting tense".
2. It's perfect now.
Sometimes, if the research you are talking about happened recently, you can use the present perfect tense: the recent research shows this point, and this tense is also used to express the past research commonly used in current papers: serious LRes ear chers studied them.
Brief introduction to literature review:
Literature review is a writing style different from graduation thesis. Based on extensive reading and understanding of the literature in the research field involved in the topic selection, it comprehensively analyzes, summarizes and comments the research status, new level, new trends, new technologies, new discoveries and development prospects in this research field, and puts forward its own opinions and research ideas.
It requires the author not only to comprehensively sort out and state the main points of the materials he has consulted, but also to make a more professional, comprehensive, in-depth and systematic discussion and corresponding evaluation of the comprehensively sorted documents according to his own understanding and understanding, rather than just "piling up" academic research in related fields.
Literature review is a style different from research papers, which is composed of understanding, sorting, comprehensive analysis and evaluation after researchers read the literature on a certain topic in advance. Searching and reading literature is an important prerequisite for writing a review. The quality of the review depends largely on the author's mastery of the latest literature related to this topic.