很简单。我来告诉你。
1
I
think
that
it
is
necessary
to
do
exercises.---------这是宾语从句,that是宾语从句的连接词,think是主句的谓语动词。that后面的是从句部分。
2
we
all
think
it
necessary
to
do
exercises.---------这是简单句,其中:
we
all(主语)
think
(谓语)it(形式宾语)
necessary(宾语补足语)
to
do
exercises(真正主语)
3
find/think/believe一般都是这样行为的。
现在你明白了吗?