现在完成时态

动词必须用现在完成时态

The verb must be in the present perfect tense

现在完成时态是中学英语语法中的重点和难点，经常给师生带来困惑。

As one of the most important and confusing grammatical tenses in high-school English , present perfect tense brings about much perplexity to both teachers and students .

我已经完成了是现在完成时态的一个例句。

` I have finished ' is an example of the present perfect .

用括号里动词的现在完成时态来填充空格。

Fill in the blanks with the present perfect tense of the verbs in brackets .

掌握现在完成时态以及不规则动词的过去时态和过去分词。

To grasp the Present Perfect and the Irregular verbs ' past tense & past participle tense .

我们经常用现在完成时态来说新闻：尤其常见于报道、信函、会话。

We often use the present perfect to give news : it is especially common in reports , letters and conversations .

本研究旨在探究母语为汉语的学生在习得英语现在完成时态时，其过渡语中母语时体特征的表现方式、存在原因和发展趋势。

The present study aims to explore how Chinese temporality influences the acquisition of English present perfect tense , why the influence sustains and what tendency will be shown in the learning outcomes of learners at different proficiency levels .

现在完成时和过去时之间的差别分析起来有点复杂和困难，语法的已知规则总不是很明白或精确。在许多欧洲语言里，有现在完成时态；

The differences between the present perfect and the past simple are complicated and difficult to analyse , and the rules given in grammars are not always very clear or accurate .