Subject + 掉到 + Place
掉到 (diàodào) means "to fall to" or "to drop onto," describing an object falling from one place to another. 掉 means "to fall" and 到 indicates the destination or endpoint of the fall. It is commonly used to describe objects falling to the ground or into a container.
手机从桌子上掉到了地上。
Shǒujī cóng zhuōzi shàng diào dàole dì shàng.
The phone fell from the table onto the floor.
小心别让钥匙掉到水里。
Xiǎoxīn bié ràng yàoshi diào dào shuǐ lǐ.
Be careful not to let the keys fall into the water.
一片树叶掉到了我的咖啡杯里。
Yī piàn shùyè diào dào le wǒ de kāfēi bēi lǐ.
A leaf fell into my coffee cup.