Question

it difficult和it is difficult的区别

Answer 1

区别是
it is difficult是一个完整的句子也可以引导一个句子后接从句
it difficult前面需要加动词修饰 宾+宾补
词汇分析
it is difficult
短语
It is not difficult 不难 ; 不困难
But it is difficult 但是那是困难的 ; 但是很难
it is too difficult 对我来说太难了
It is increasingly difficult 难度越来越大
It is very difficult 那太困难了你要我怎么办
It is really difficult 难
1.It is difficult to relate these results with any known cause.
这些结果很难与任何已知的原因联系在一起。
2.At this distance of time it is difficult to date the fossil.

时间隔得这么久了，很难确定这化石的年代。
3.It is difficult to separate legend from truth

很难将传说和事实区别开来。
4.It is difficult to obtain reliable evidence.

这很难取得可靠的凭据。

it difficult
1.I can understand why astronauts find it difficult to readjust to life on earth
我能够理解为什么宇航员发现重新适应地球上的生活不容易。
2.He might find it difficult to return to the family fold when he realizes his mistake.

他可能会发现等他意识到自己的错误时再想重返家族已经非常难了。
3.That makes it difficult to contemplate the idea that the present policy may not be sustainable.

那让人难以认真思考这个可能，即目前的政策也许并不能持续下去。
4.You will find it difficult to construct a spending plan without first recording your spending

你会发现不先把自己的开销记录下来就很难制订支出计划。

Answer 2

it is difficult 是主系表结构,是个完整的句子
it difficult 不是完整的句子,可以用于宾+宾补

如：Smoking makes it difficult to keep health