study的过去式是什么

Study 的过去式是 studied 。Studied ：动词形式，意为研究、学习、攻读、审视、端详、细看、调查；形容词形式，指刻意的、精心安排的。它同时也是 study 的过去分词形式。

相关介绍：

His face was a study in concentration.

他的脸上完全呈现出全神贯注的神情。

This study represents a major expenditure of time and effort.

这项研究意味着要投入大量的时间和精力。

This study is the cornerstone of the whole research programme.

此项研究是整个研究计划的基石。

The first year provides students with a sound theoretical basis for later study.

第一年为学生后续的学习提供了坚实的理论基础。

The content of the course depends on what the students would like to study.

课程的内容取决于学生想要学习的内容。