“it's hard to say”的句子结构?

“it's hard to say”的句子结构? it's hard to say It's just hard to say goodbye的意思? it s hard to say goodbye下载 It's hard to say意思 it's so hard to say It's unlike you not to say hello.请分析一下此句子的结构 It"s easy to say,but it "s hard to do.的意思 it hard to say It's So Hard To Say Goodbye To Yesterday歌词 It's So Hard to Say Goodbye to Yesterday 歌词 R :"It's easy to say,but hard to do."