此句为什么从句?they realise that it is of great value to record and

此句为什么从句?they realise that it is of great value to record and I think your advice is of great to me and it's .A.value,well 翻译It is one of their ways to show that they grow up and they 连词成句that,it,think,we,is,difficult,set,to,world,a,record It seems that it is going to rain.我在语法书上看到此句为“It 做形式主语的主语从句” _____ is a great honor to be invited here today.此空填it还是that? They have prover themselves to be of great commercial value里 汉译英 and It is the first step that is difficult to take.great 请 They feel that Wales is a fairy land.此句是宾语从句还是表语从句? It is not when to do it but how to do it that is of great im it is of great help to me. This book is of great value to me.的of是表示什么?