C1007 Understanding the Cause

The next day, on my way to school, I called Old Chestnut.

"Ah, son, why are you calling me so early in the morning?" Old Chestnut said.

"Are you up yet? I hope I didn't disturb your sleep? " "No," I said.

"I always get up at five in the morning and I'm having tea at the teahouse. What are you doing? Do you want to drink tea with me? " Old Chestnut said.

"I have to go to school