somebody cannot but do something?是正式短語郁季，通常用于書面冷溃，不用于口語梦裂，意為“不得不”。
多種表達“不得不…凿歼；非…不可冗恨；不禁…”的短語如下，cannot可縮寫為can't：
can't help being so cute
書面：
cannot but do
cannot choose but do
- I cannot but admire her. 我不得不佩服她掀抹。
- I cannot choose but go at once. 我不得不馬上去。
口語：
cannot help but do
cannot help doing【注意cannot help后面的兩種不同動詞形式】
cannot help oneself from doing
have no (other) choice/alternative but to do【注意有to】
- I cannot help laughing. 我不禁笑起來。
- I had no choice but to resign. 我不得不辭職谱轨。
