building a sandcastle - 堆沙堡

I I am I am building I am building a I am building a sandcastle I am building a sandcastle on I am building a sandcastle on the beach

我 我在 我在堆 我在堆一个 我在堆一个沙堡 我在海滩上堆沙堡 我在海滩上堆一个沙堡