這可以有兩種解釋： 1) all he needs to do is ... = 他所需要做的是 ... "all he needs to do" 整個輔句就可以稱為是此句的主語；"is" (to be) 是主動詞；而 "is" 後面所描述的就是賓語(謂語) 。 2) all he needs to do is ... = all that he needs to do is ... 在此情況下，"that he needs to do" 就變成闡述 "all" 的關係從句 (relative clause)，這樣 "all" 就變成主語了。 很可惜的是，我已忘記到底應該以哪個解釋才比較符合語法的規律。:) --- 祝　週末愉快。/ Good weekend.

"all he needs to do is" = 主语 in the main sentence. (All he needs to do is....) However, in the small sentence, "all he needs to do", the 主语 is "he". "All" is the 宾语.

先翻译成中文： 他需要干的所有的事的是.... 很明显，这个句子的主语是"他需要干的所有的事的的"。 谓语是“是”。 表语是“....” all 是形容词当名词用.