阐述了科技论文中英文摘要的语言结构特点、时态和语态的正确运用及独特的写作要求。

This paper describes the language characteristics, the structures, the correct application of tense and voice and the unique writing requirements of English abstract in scientific research papers.

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不定式可以带宾语或状语构成不定式短语，没有人称和数的变化，但有时态和语态的变化。

Infinitive form can take object or adverbial infinitive phrase, there is no person and number of changes, but sometimes tense and voice changes.

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介绍了商务合同的概念与内容，从措词、结构、时态和语态等方面分析了英语商务合同的语言特征。

This paper introduces the concepts and contents of commercial contract, and analyzes the language features of English commercial contract from the wording, structure, tense and voice.

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