改为含宾语从句的复合句

Li Lei wants to know if Peter came here yesterday.
OR
Li Lei wants to know whether Peter came here yesterday (or not).
两句并一句通常中间需要一个连词（根据句意来选择）,Did Peter come here yesterday?这是一般疑问句,译为“Peter是不是昨天来这了”.那么中间的连词就是“是否”用if/whether.“Li Lei wants to know”这是主句一般照原句抄,“Peter came here yesterday”是从句,应把Did Peter come here yesterday?的语序改成陈述句语序同时注意时态“Peter came here yesterday”
如果句子改成
Li Lei wants to know_____Peter_______here yesterday or not.就只能填whether.(whether...or not.固定搭配)
ps:这题目其实有点问题的,前后的时态不一致.
我觉得应该改成Li Lei wanted to know_____Peter_______here yesterday.这样就对了.