i don't think it advisable that Tim be assigned to the job since he has no experience为什么不是这样写i don't think it is advisable that Tim be assigned to the job since he has no experience就是多了个is 解释下语法原理

i don't think it advisable that Tim be assigned to the job since he has no experience为什么不是这样写i don't think it is advisable that Tim be assigned to the job since he has no experience就是多了个is 解释下语法原理
i don't think it advisable that Tim be assigned to the job since he has no experience
为什么不是这样写
i don't think it is advisable that Tim be assigned to the job since he has no experience
就是多了个is 解释下语法原理

i don't think it advisable that Tim be assigned to the job since he has no experience为什么不是这样写i don't think it is advisable that Tim be assigned to the job since he has no experience就是多了个is 解释下语法原理
你说的是省掉that的宾语从句
it可以做形式宾语 如I found the game interesting可以变成I found it interesting
不是省掉is 而是压根不用系东西 即主语+宾语+形容词

我也不知道，哈哈哈哈

没有it的话应该口语化点，还有语气强调一点。其实很多时候英语都是有惯用跟不惯用之分，而没有对错之分