有个句子是：I think it advisable to wait.为什么不是I think it is advisable to wait呢?

有个句子是：I think it advisable to wait.为什么不是I think it is advisable to wait呢? i dont think i can do it是个什么句子 是不是什么定语从句 表语从句? 为什么dont 要加在think前面?如题 I think it difficult to answer this question 为什么可以it 不加is?it是形式宾语有和这个有什么关系?为什么加个形式宾语就避免句子头重脚轻了? i think it necessary to do it.这个句子能不能写成i think to do it necessary.有语法错误吗. I think it important to study English well.与I think it is important to study English well.的区别.请问第二个句子有没有问题,我习惯上用第二个句子,但是感觉是个病句呢?求指点,谢谢. 关于宾语从句中be与谓语动词的问题老师讲过,宾语从句中的its 加形容词句型要省略be ,即i think it good for her to work hard ,i find it difficult to do this .但是书上有个句子是i said ididn't think it was agood ide 请问高手英语句子结构到底是什么样子的,不要又是什么5种类型,请告诉最直接有用的.请问英语的句子结构到底是怎么样的,老师说是SVOA,比如think it carefully.A为ADJ或是ADV..可是也有She is a beatuful I will find it +adj还是adv? I will find it +adj还是adv think后加句子还是短语l think it is good.是加句子有l think it good吗？think sth adj. So+adv+that造2个句子 I _____ _____ difficult to get up early. 我认为早起很困难是有一个句式为 think it +adj.+to do sth. 问问为什么会没有be动词? 这里think后面的句子应该是宾语从句是个完整的句子才对嘛? 分析下句子 I think it helps.it helps. I think it must be teenagers having fun.这句话的句子结构是怎样的 I think it is at home.这个句子是怎么组成的? I think it’s strange that you think I’m funny 请从语法角度分析?为什么 是 strange 后面有一个that ,是从句吗?这个句子是什么意思? i think i love it 和i think i like it有语病吗 I want think it will snow tomorrow.这个句子对吗?