Sometimes he would sneak out of his house late at night to be with me.

有时候他会在深夜偷偷溜出他的家来陪伴我。

He smuggled papers out each day, photocopied them, and sneaked them back.

他每天都把文件偷带出来，复印后又偷偷送回去。

You sneak a look at your watch to see how long you've got to wait.

你偷偷看一眼手表，看还要等多久。