文法釋義（nothing but用法）

He did nothing but _____ for her coming back.
(A) wait
(B) waited
(C) waiting
(D) to wait

He enjoys nothing but _____TV at home.
(A) watch
(B) watched
(C) watching
(D) to watch

He wants nothing but _____TV at home.
(A) watch
(B) watched
(C) watching
(D) to watch

關於這三個題目，其實一般的人都會用以下這個邏輯做思考：
「nothing做前面及物動詞的受詞，but是對等連接詞，所以要跟前面的動詞一致。」

有時文法令人又愛又恨就是因為邏輯說得通，但是方向錯了那一點意義也沒了，因為答案就錯了。

請注意，nothing but這個片語，就等於only，當做adv，基本上adv在句子裡面，除了否定副詞以外，分析時都可以省略：

ex. He is very handsome. = He is handsome.

但是否定副詞就不能亂省了：

ex. He never likes you. 不等於 He likes you.

所以如果把上面三個題目的nothing but = only省略，就變成了：

He did _____(wait) for her coming back.
He enjoys _____(watch) TV at home.
He wants _____(watch) TV at home.

第一題的did是助動詞，所以後面接原型wait
第二題enjoys後面接Ving，所以答案watching
第三題wants後面接to Vr，所以答案用to watch

學起來吧！