study的过去式是什么单词,study的过去式是什么 _过去式

study过去式是：studied；复数是：studies；第三人称单数现在时是：studies；现在分词是：studying；过去分词是：studied 。
基本字义study
英['st?d?] 美['st?di]

n.学习，研究；课题；书房；结论
vi.考虑；沉思；默想；努力
vt.想出；详细地检查；背诵（台词等）；为…费心思
双语例句1.She gave up her studies to have Alexander.
为了生亚历山大，她放弃了学业。
2.She is currently doing a business studies course at Leeds.
她目前在利兹大学修读一门商科课程。
3.Debbie studied her friend's face for a moment.
黛比仔细端详了一会她朋友的脸。
4.I know that you've been studying chimpanzees for thirty years now.
我知道你研究黑猩猩至今已有30年了。