Subject + 掉进 + Place/Container
掉进 (diàojìn) means 'to fall into' and is a directional verb compound made of 掉 (to fall/drop) and 进 (to enter). It describes something or someone physically dropping into a space or container, such as falling into water or a hole.
小猫不小心掉进了水里,吓了一大跳。
xiǎo māo bù xiǎoxīn diào jìn le shuǐ lǐ, xià le yí dà tiào.
The kitten accidentally fell into the water and got a big fright.
他走路没注意,差点掉进路边的坑里。
tā zǒulù méi zhùyì, chàdiǎn diào jìn lùbiān de kēng lǐ.
He wasn't paying attention while walking and almost fell into a pit by the road.
一片树叶掉进了我的咖啡杯里。
yí piàn shùyè diào jìn le wǒ de kāfēi bēi lǐ.
A leaf fell into my coffee cup.