He found it difficult to work out the problem.

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He found it difficult to work out the problem.
为什么英语中要有形式宾语,没有它可以吗?

1.若是Vt+名词(O)+形容词(OC),则不可用形式宾语(it),例如：
He made his intention clear.
I will keep myself warm in the heavy clothing.
They held her story true after hearing it.
Fast transportation has made the round trip possible.
2.但宾语是不定词或名词子句时,须用形式宾语(it),写成Vt+it (虚O)+形容词(OC)+ 不定词或名词子句(真O),例如：
He made it clear what he intended to do.
I take it for granted that you will give me a hand.
They feel it necessary to work harder.
Airplanes make it possible to travel around the world in a short time.
3.前例2全部it (虚O)不能省略.为何用虚宾语(it)呢?因为真宾语太长,试看：
(X) Airplanes make to travel around the world in a short time possible.
现行英语不成立.

He found it difficult to work out the problem. I found it difficult to work out the problem without your he He found () difficult to work out the problem in such a shor I found it difficult to work out the problem.中it可以换成it's吗?为什 He is busy to work out the difficult problem. 改错 it is difficult to work out the problem 对work out the proble All of us found ( )difficult to work out the maths problem. 一道英语填空All of us found difficult to work out the math problem The problem is very difficult.He can't work it out.(合并为一句） So difficult it to work out the problem that i dicided to as So difficult __ it to work out the problem that I decided to ____,he can not work out the difficult problem