英语I don't know how old you are.Can you tell me who is on duty today?为什么前面一句是陈述句语序,而后面一句be在前面呢

问题描述:

英语I don't know how old you are.Can you tell me who is on duty today?
为什么前面一句是陈述句语序,而后面一句be在前面呢