is的过去式是was，没有过去分词。

was：v.用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ）；在，存在；不受干扰。

相关介绍

例句：

His life was drawing to a close.

他的生命正走向终点。

We were amazed to find that no one was hurt.

我们很惊异地发现竟没有人受伤。

Don was deep in conversation with the girl on his right.

唐与他右边的女孩在专心交谈。

Don't worry; the deal was completely above board.

别担心，交易是完全合法的。