完成时在英语中是一个重要的时态。

The perfect tense is an important tense in English.

你能给我一个关于完成时的例子吗？

Can you give me an example of the perfect tense?

完成时在描述过去的动作时非常有用。

The perfect tense is very useful for describing past actions.

我们在学习英语语法时学到了完成时。

We learned about the perfect tense in our English grammar class.

她已经掌握了如何正确使用完成时。

She has mastered how to use the perfect tense correctly.

现在完成时经常变成过去完成时。

The present perfect tense (have always been) usually changes to the past perfect tense (had always been).

现在完成时和过去完成时都属于完成时态.

The present and past perfect tenses both belong to the perfect tense.

法语中没有和英语的现在完成时完全对应的时态。

French tense to the present perfect tense in English.

说明某个课题现在已经取得的成果,适宜采用现在完成时.

Explaining some topic already obtained uses present perfect tense.

完成时句子中，情态不定式与动词不定式的位置关系；

The order of modal infinitive and infinitive in perfect tense sentences;