22. 很多本来可以获救的人却死了。

    误：A lot of men died who could be saved.

    正： A lot of men died who could have been saved.

    析：对过去情况进行推测，要在情态动词后接完成式，而不能接一般式。有时含有责备或后悔之意。又如：

    You could [might] have made greater progress. 你的进步本来可以更大一些的。

    23. 你最好带些钱，以防万一。

    误：You’d better carry some money for case.

    正：You’d better carry some money in case.

    析：in case 通常用作连词 ......