We could not help thinking when we saw the Great Wall in China.
看到中国的长城,我们不禁浮想联翩。
I couldn't help crying when I heard the bad news. 听到那不幸的消息,我忍不住大哭起来。
cannot help but do sth. 也表示不得不、忍不住。例如:
We could not help but walk from dawn to dusk. 我们不得不从黎明走到黄昏。
Hearing the inspiring news, we couldn't help but cheer. 听到这个鼓舞人心的消息,我们不禁欢呼起来。
2. cannot but do sth :该结构表示不得不。例如:
I cannot but admire his courage. 我不得不钦佩他的勇气。
I couldn't but laugh on reading such a funny joke. 读到如此滑稽的笑话,我忍不住笑了。
在上面句式里,可以说 cannot 后面省略了 do anything .例如:
The prisoner could not ( do anything ) but hand in his knife. 那个犯人不得不交出刀子。
can but do sth. 表示只得做某事。例如:
The boy made an apology to his teacher, so the teacher could but give up the idea of punishing him. 那男孩向老师道了歉,老师只得打消惩罚他的念头。
类似这一结构的 cannot choose but to sth 也表示不得不、只得。例如:
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