现在完成时和过去完成时是完成时态的例子。

The present perfect and the past perfect are examples of ___the ___perfect.

完成时态由助动词'have'和过去分词构成。

___The ___perfect is constructed using the auxiliary verb 'have' and a past participle.

在语法课上，我们学习了完成时态及其各种用法。

In grammar lessons, we studied ___the ___perfect and its various uses.