He slowly go down the stairs.

他慢慢地从楼梯下去。

Hold the handrail when you go down the stairs.

下楼梯时请抓住扶手。

Hold onto the railing when you go down the stairs.

下楼时抓住栏杆。

B:Go down the stairs over there.

从那边阶梯下去。

I heard the boy go down the stairs.

我听到这个男孩走下楼去。