do，不得不、只能这样做的意思。
不得不：can't but do can't的过去式couldn't
不得不有三种：can't but do, can't help but do, can't choose but do。
双语例句：
1、I could not verify this news, but I do hope it is true.
我无法证实你所说的这个消息的准确性，但我希望它是准确的。
2、We thought that he could not cover the passage in quarter, but he have accomplished to do it.
我们认为他不能在一刻钟内走完那段距离，但他却成功地做到这一点。
扩展资料：
不得不的其他表达方式：have to ; cannot but ; be conscripted to。
1、have to
相关短语：have nothing to do 无事可做 ; 无关 ; 没有任何关系
have time to burn 有用不完的时间
have occasion to mention 有必要提及
have power to nullify 有权撤销
例句：
You have to keep after your son if he refuses to be housebroken.
如果你儿子不服管教的话，你必须整天跟在他的身边。
2、cannot but
相关短语：
cannot help but 禁不住 ; 不禁 ; 无奈
cannot choose but do 只得 ; 只好做 ; 翻译
例句：And if you cannot but weep when your soul summons you to prayer, she should spur you againand yet again, though weeping, until you shall come laughing.
如果你们的灵魂召唤你们时你们只能哭泣，那么她会在哭泣中一再鞭策你们，直到你们欢笑。
参考资料来源：有道翻译--could not but do