We saw a boy fall into the river while going through the bridge.

当我们过桥的时候，我们看见一个男孩儿掉进河里。

youdao

When we were walking across the bridge we saw a boy fall into the river.

当我们过桥的时候，我们看见一个男孩儿掉进河里。

youdao

When we were walking across the bridge we saw a boy fall into the river.

当我们过桥的时候，我们看见一个男孩儿掉进河里。

youdao