同学你好，该知识点来自沪江网校《简明法语教程上、下册连读【12月班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
这里it是形式宾语，真正的宾语是to help those who are in need，宾补是our duty
因为宾语太长了，所以用了形式宾语。
I consider it my duty to write to you and thank you.
我认为写信向你表达谢意是我的责任。
They consider it better to do it that way.
他们以为那样做比较妥当。

其他形式宾语常用句型：

1. 动词+ it + that-从句。如：
I like it that you came. 你来了，我很高兴。
You can put it that it was arranged before. 你可以说这是以前安排的。


2. 动词 + it + when (if)-从句。如：
I dislike it when you whistle. 我不爱听你吹口哨。
We really appreciate it when she offered to help. 她来帮忙了，我们十分感激。

3. 动词 + 介词 + it + that-从句。如：
See to it that you’re not late again. 注意千万不要再迟到。
Look to it that this doesn’t happen again. 注意不要再发生这种事。

4. 动词 + it + 介词短语+ that-从句。如：
I owe it to you that I am still alive. 多亏有你我才仍然活着。
I took it for granted that he would help us. 我认为他会帮助我们的。


祝同学学习进步~