是的，一个句子里可以出现两个过去式，但需要满足一定的条件：

并列句 ：在并列句中，两个过去式可以分别作为两个并列分句的谓语动词部分，并且需要用并列连词如and、or、but等连接。

复合句：

在复合句中，主句和从句可以分别使用过去式，表达的意思前后都在同一时刻发生的。

从句：

如果句子中有从句，从句中的谓语动词可以使用过去式，主句的谓语动词也可以使用过去式，但两者之间需要有连词连接。

并列句

I went to the store and bought some milk.

She started to learn French and then she traveled to France.

复合句：

If I had known you were in town, I would have called you.

He was tired and hungry, so he went to bed early.

从句：

She said that she had finished her homework.

They found that they had been to Paris twice.

需要注意的是，在简单句中，通常只能有一个主要的谓语动词，不能同时出现两个过去式。如果需要表达两个动作，可以考虑将句子拆分成两个简单句，或者使用并列结构。