study，动词，意为学习

其八种时态如下：

1、一般现在时：study

2、现在进行时：studying

3、过去式：studied

4、过去分词：studied

5、现在完成时：have studied

6、现在完成进行时：

have been studying

7、过去完成时：had studied

8、过去完成进行时：

had been studying