时态

The Present Perfect Tense is formed by combining an auxiliary verb with a past participle.

现在完成时态的形成方式是把助动词和过去分词结合起来。

The Past Perfect Tense is formed by combining the auxiliary verb 'had' with a past participle.

过去完成时态的形成方式是把助动词'had'及过去分词结合起来。

It was Tuesday, February 18, when the 1 rang in the kitchen of my Los Angeles home. On the 2 was Marty Banderas, a literary agent to whom I had sent a draft of my novel three weeks earlier.

本文用了&倒叙&手法，这种手法在英语中是通过时态体现的，这一点，对于学生来说很容易忽略，因为中文不存在动词变形问题。

Bush said the signing will begin a new period in relations between the United States and Russia. He said it will make the world more peaceful and put old aggressions in the past.

以上两句主句皆为一般过去时，而宾语从句均为一般将来时态，可能是因为作者认为&该条约的签署将揭开两国关系的新篇章&等具有必然性，或者表示说话者Bush的一种强烈的愿望。

At the syntactical level, verb tenses, subject-verb agreement,the singular and plural forms of nouns, misuse of articles and prepositions, and the superl...

在句法方面，动词的时态、主谓一致性、名词的单复数、冠词和介词的误用、以及形容词的比较级和最高级都是学生的薄弱环节。

Most cultures have a grammar with past and future tenses, and also demarcations like seconds and minutes, and yesterday and tomorrow.

大多数语言文化中的语法有过去和将来时态，有秒、分、时，有昨天和明天的划分。

A framework of temporal topological relationship representation based on point-set topology, which can be used to describe temporal topological relationships completely and uniquely, is presented.

同时，给出了时态拓扑关系完备且唯一的点集拓扑理论描述及其等价的逻辑谓词描述。

English tense system has always been one of the main subjects for linguists and grammarians .

英语时态系统一直是语言学家和语法学家研究的主要对象之一。

The traditional grammarians call it "perfect tense", but it is limited by time and tied by tense.

传统语法家称它为&完成时&，但局限于一个时间平面，受时态范畴的束缚。

English tenses , especially past tense , is always a hot issue of the traditional grammarians .

然而关于英语过去时态的诸多用法的形成原因，特别是其选择的恰当性方面就显得无能为力。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。