一主,二宾,三不变
第一人称看主语,
“May I use your knife?” He asked me. →He asked me if he might use my knife.
第二人称看宾语,
“Do you know her telephone number?” He asked me.
→He asked me if I know her telephone number.
第三人称不变
Do you know? Where does he live? →Do you know where he lives?