turn on / off the tap

开/关龙头

She felt a tap on her shoulder.

她感到有人在她肩上拍了一下。

tap sb on the shoulder

轻拍某人的肩膀

Someone is tapping at the door.

有人在轻轻叩门。

I tap my feet and sing along with him.

我用脚踩着节拍跟他唱起来。