1.结构分析:
主语I,谓语consider,宾语it,宾语补足语the start of a long learning journey.
2.纠正二楼:
it不是形式宾语,而是真正的宾语;the start of a long learning joutney不是真正的宾语,而是宾语补足语.
3.
consider意为“认为”时有以下固定结构:consider + 宾语(sb/sth) + 宾语补足语(to be + 名词/形容词/介宾/副词/分词等),且其中的to be可以省略.
再如:I consider him (to be) clever.
I consider him (to be) a student.
4.如果加上is,即句子变成:
I consider (that) it is the start of a long learning journey.
此时consider后面是一个以that引导的宾语从句;
在宾语从句中,it是主语,is是系动词,the start of a long learning journey是表语.