口诀如下：
1. 一般现在时：主语+动词原形
如：I play basketball every day.
2. 一般过去时：主语+动词过去式
如：I played basketball yesterday.
3. 现在进行时：主语+be动词(am, is, are)+动词的ing形式
如：I am playing basketball now.
4. 过去进行时：主语+be动词(was, were)+动词的ing形式
如：I was playing basketball at 6 p.m. yesterday.
5. 现在完成时：主语+have/has+动词的过去分词
如：I have played basketball for 2 hours.
6. 过去完成时：主语+had+动词的过去分词
如：I had played basketball for 2 hours before I went to bed.
7. 将来时：主语+will/shall+动词原形
如：I will play basketball tomorrow.
8. 过去将来时：主语+would/should+动词原形
如：I said I would play basketball with him.
这些口诀可以帮助学生快速记忆动词的基本变形，但需要注意的是，动词的变形还包括被动语态、虚拟语气等其他形式，需要结合具体语境进行理解和记忆。
