I was busy job hunting.請問busy後要接on or at等介系詞嗎?busy及job文法關係為何?

就這個句字而言, 文法上可能要加介系詞, 但一般不加介系詞比較順. 

最常聽到的是有人問最近在忙什麼, 另一個人回答I was busy working. 用介系詞的說法是I was busy at work. 假如套用同樣的公式, 這句可以說成I was busy at job hunting. 不過不加反而比較順, 最少在口語上是這樣. 

(1) job (n.) + hunting (n.) 形成複合名詞, 一般要加上"-", 成 job-hunting.
busy後接名詞, 一般要加上介系詞 "with" 作為形容詞補語 :
~ I was busy with job-hunting.

(2) 作為動詞的hunt(不及物), 亦可成為形容詞busy的補語, 但要變為現在分詞,如:
~ I was busy hunting for jobs.

1，本句若寫成I was busy to hunt job.是以不定詞表未來會忙於找工作，但本句I was busy(on) job hunting.將介詞省略，惟文法分析時需還原成介詞片詞修飾busy，用名詞 job hunting表動作同時發生與不定詞不同
2，另動詞後加動名詞表同時發生，與本句有異曲同工之妙，如 I sit eating fruit.另種寫法供參考。

I was busy-----subject +vt
in job hunting------prep/adverbial phrase to the verb "was"

不用
busy後可直接接job huntin'

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如果怕 busy 後面 不加任何介系詞 有誤

I am busy looking for job

基本上我會寫 I was busy for job hunting 或者是 I was busy on job hunting . 
對我來說 BUSY 是形容詞 JOB hunting是 名詞 解釋前面為什麼忙碌

I was busy with job hunting. or I'm busy with job hunting.