I prefer A to B 是主句,I am sorry to say是评注性状语,你也可以视为插入语。另一种分析:I prefer A to B 为自由直接引语作为主句,I am sorry to say为引述分句作插入语。如果给直接引语打上引号,就成了普通的直接引语了:I am sorry to say, "I prefer A to B."
1. I am sorry to say, I prefer a to b. 口语特点,用逗号停顿代替 that, I prefer a to b 为 say 的宾语从句。I am sorry to say, I prefer a to b. = I am sorry to say (that) I prefer a to b.
2. I am a dog, I eat meat. 无法与上句相提并论。这是并列句,缺少并列连词,改为:I am a dog, and I eat meat.。那个是主从句,是用逗号代替了从属连词 that。
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