I don't think it advisable that Tom be assigned to the job since he has no experience.

Question

I don't think it （为什么不加is）advisable that Tom be assigned to the job since he has no experience.

Answer 1

这是一个宾语从句哈，I don't think（ it ）advisable

真正的宾语是（that Tom be assigned to the job since he has no experience.）

原来的语序应该是，I don't think （that Tom be assigned to the job since he has no experience ）advisable .但是由于宾语是个长句，显得累赘，所以用一个it 来替换它，作形式宾语，就成了
I don't think it advisable that Tom be assigned to the job since he has no experience.

类似的用法还有 形式主语，我举个列子，你就会明白为什么老师然你们记住很多由it 引导的句型啊，短语了，
it is no use to do or doing sth. It's +形容词+to do sth 或者that 从句

it is no use to advise her to come back to your arm. (to advise her to come back to your arm is no use)

it's healthy that wash hands before meals.( that wash hands before meals is healthy )

希望对你有帮助，谢谢！

Answer 2

think 后不是从句。而是think sth adj 。think的一种语法。认为什么怎么样。后可加形容词，名词。本回答被提问者采纳

Answer 3

形式宾语追问

能不能把他的结构讲一下？