英语语法超级纠结中1 He was excited To such an degree that he couldn’t

英语语法超级纠结中
1 He was excited To such an degree that he couldn’t sleep last night.
改成so/such...that 是
To such an degree was he excited that he couldn’t sleep last night.
2 The boy is interested in such a lovely toy that his parents decide to buy it for him.
若这句要改成such ...that倒装的话 是
Such a lovely toy is the boy interested in that his parents decide to buy it for him.
还是
In such a lovely toy is the boy interested that his parents decide to buy it for him.
之所以有这样的疑问是因为 1中的 介短To such an degree 是做句子的程度状语的,为一整体,一块移至句首.而2中的 be interested in是个固定用法,到底in要不要也移到句首呢?be interested in sth 虽为固定,但就句子成分划分,in sth 是不是也是做谓语 be interested的状语的呢?到底这种 be+ adj+ perp sth 是如何划分的?“be+ adj+ perp是 谓语 sth是 宾语?”还是“ be+ adj 是谓语 perp sth 是状语” 另外还有 ,那定语从句中介词怎么能即可放在that/which前面,也可放在定语从句的后面呢?
这里一直很晕菜,可能是我太笨,理解能力不够.谁能帮我仔细讲解下.

答：你的问题很好,但又很不好 回答.
注意到我上面打的字了吗?我故意将一个意群拆开了.就是这个“不好”,是与“回答”结合紧密还是和“很”结合紧密呢?应该是前者.所以翻译成英语时,这两个“好”是不一样的.
我们知道,介词单独不作句子成分,必须加上名词词组构成介词短语才能作句子的成分（1.状语、2.定语、3、补语（包括表语）） 我们又知道,有些不及物动词加上一个介词后可以组成一个短语动词,相当于一个及物动词,如：look for his wallet .大家都将look for 看成一个整体,一个意群,而不看作：look for his wallet .其实你非要这么去理解,也未尝不可：为了他的钱包,到处在看.（这种思维,对于记忆look for是“寻找”,也是有益处的）
象汉语字谜问题：什么食品吃得开?---罐头食品（吃得开）.这后面一句,通常的思路是：罐头食品 吃得开.特别的的思路：罐头食品,吃 得开.（当然这是文字游戏,猜字谜常用）
再来看你的问题：sb.is interested in sth.通常的思路是：Sb.is interested in sth.
但English speakers中,可能也有跟我们汉语思维一样的理某人 对某事 感兴趣：Sb.is interested in sth.
你上面的两句中,to与后面的结合较紧,in 与be interested结合较紧.还是习惯自然吧.
至于定语从句,这两个,介词提不提前都有可能,问题不是很大.
2 The boy is interested in such a lovely toy that his parents decide to buy it for him.
若这句要改成such ...that倒装的话 是
Such a lovely toy is the boy interested in that his parents decide to buy it for him.
还是
In such a lovely toy is the boy interested that his parents decide to buy it for him.
感觉这题句是生造的,such ...that...中That从句是结果状语从句.感觉前后句没有这样的逻辑.
有没有,译成汉语就知道.
the boy is so interested in ...that his parents .有可能.（逻辑思维上还是有跳跃）父母决定给他买,其实是因为爱他.是爱他的结果,非也感兴趣的结果.
再问： 对于此种句式，要是语法上给出 be+ adj+ perp是个固定时，在习惯上不能将意群掰开，此时perp无须前置，而像例1那样是明显做状语就要perp一块前置。能否这样理解？ 就是您所谓的“习惯自然”么？
再答： 是的。语法其实就是记录语言规律的。它不是人为规定，与法律不同。