hadlearned是什么时态

　　例句：

　　A timid child, Isabella had learned obedience at an early age.

　　伊莎贝拉是一个羞怯的孩子，很小的时候就已经学会了顺从。

　　Students learned the practical application of the theory they had learned in the classroom.

　　学生们学会了课堂上学到的理论的实际应用。

　　Sid had learned his lesson days before.

　　希德几天前把他要学的段落背熟了。

　　Dinner time seemed perfect for sharing what we had learned

　　晚餐时间似乎是一个完美的机会让我们可以分享所学所想。