making it their duty to do it 这个短语的语法结构?

英语翻译和这个词组:It's duty to do it is our duty to do This is the way to do it.语法结构是? 固定结构中例如often see sb.do sth、It's one's duty to do sth.如果跟第三人称 帮忙分析一下这个句子的语法结构吧that is all there is to it it's one's duty to do sth.翻译 When their father died,they thought it their duty to keep Er ① I think it my duty to do sth.和 i think it IS my duty to do 每天做作业是我们的责任（it's one' duty to do) it is not only to do good to...,but it .这个语法有错误吗 英语翻译it's nothing to do with me 语法上怎么解 是否包含固定短语 It shows where all the companies have their booths.这一句话的语法结构