问题补充：
To be honest,your pronunciation is not so good.中的To be honest做状语吗To be honest,your pronunciation is not so good.中的To be honest和To your joy,they arrived safely中的To your joy都是状语吗?这样子的句子都是做状语吗（to 什么的）?
答案：
不是的,可以做插入语,比如to one’s surprise.还有,不定式短语作插入语.
能用作插入语的不定式短语有：to be frank,to be honest,to be sure,to tell you the truth,to make matters worse,to sum up,to start with,to begin with等.如：To be frank,I don’t quite agree with you.坦率地说,我不太同意你的意见.To tell you the truth,I’m not so interested in the matter.跟你说实话,我对这件事情的兴趣不大.To sum up,success results from hard work.总而言之,成功是艰苦努力的结果.
======以下答案可供参考======
供参考答案1:
是的！
