Question

I said to Daniel, Do you often fly to Japan?(改为宾语从句)

I asked Daniel ________ he often _______ to Japan.

Answer

if/whether flew

【解析】

此题要求改为宾语从句，首先确定引导词；本题的Do you often fly to Japan?是一般疑问句，应该用if或whether引导；宾语从句的主句I asked Daniel 是一般过去时，因此宾语从句应该用一般过去时。也就是把fly改为flew。故答案为：①if/whether②flew。