爸爸趴在地上看着我吃狗屎: While lying on the ground, father saw me eat dog shit.

我趴在土地上看着爸爸吃狗屎: While lying above the soil, I saw father eat dog shit.

我爸爸趴在土地上看着狗吃屎: While lying above the soil, my father saw the dog eat shit.