Question

英语语法中，I think it difficult to do my work.怎么理解it 为

Answer 1

楼主是不是少了个is
i
all
think
it
is
difficult
to
finish
the
work
this
morning
i主语
think
谓语
后面加的是一个宾语从句
然而宾语从句中
it做形式主语
真正的主语是（to
finish
the
work
this
morning)
因此该句就是to
finish
the
work
this
morning
is
difficult
为了避免头重脚轻
就用it做形式主语
因此也有了这么个句型
it
+
be
+adj+
to
do
sth.
希望能够帮到楼主

Answer 2

I
think
that
it
is
difficult
to
do
the
work.和
I
think
it
difficult
to
do
my
work.都可以的。
前者that引导的是宾语从句，整个句子为复合句。
后者it为形式宾语，difficult
为宾补，不定式to
answer
the
question为真正的宾语，整个句子为简单句。