我们跳舞时，我不断踩到他的脚趾。

I kept ___treading on his toes when we were dancing.

我刚刚在人行道上踩到了脏东西。

I've just ___trodden in something dirty on the pavement.

玩具被砸得粉碎，好像有人踩过它。

The toy was smashed to pieces as if someone had ___trodden on it.