如何区分英语的时态

题目

如何区分英语的时态
我要的是把同一句话用不同的时态表示
要写明是用了什么时态和中文
最好谓语是一个动词

答案

I am a student 一般现在时
I was a student last year一般过去时
I will be a student next year一般将来时
I have been a student since I was 7years old现在完成时
I had been a student by last summer 过去完成时