program的过去式和过去分词怎么写

　　例句：

　　The program can model a typical home page for you.

　　这个程序可以帮你制作一份典型的主页。

　　There are still a few residual problems with the computer program.

　　电脑程序还有一些残留问题。

　　In this class, students will learn how to program.

　　这节课学生将学习编程。