study的过去式是什么

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。

study

英['stʌdɪ] 美['stʌdi]

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

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。

5.I invite every citizen to carefully study the document.

我请每位市民都仔细研读该文件。