-we should have been more careful not to break the ball.

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-we should have been more careful not to break the ball.
-that doesn‘t matter much.unluckily,it will be a long time_____we have another.
a.until b.before c.since
until 和 before在这里有什么区别?

固定搭配
It will be a long time before / It was(a) long(time) before 很长一段时间后
主句是持续性谓语动词时,肯定,否定都可以,但意义完全不同,肯定表示动作终止,而否定表示动作开始. 1). We discussed the problem until/before he came back.
我们一直讨论到他回来.
2). We didn’t discuss the problem until he came back.
我们一直等到他回来才讨论问题.
放于句首时用until.
Not…until…句型尽管在某些情况下可与before互换使用,但在强调句中一般仍用until;

-we should have been more careful not to break the ball. we should be careful not to （养成）bad habits Look what you have done!You should have been more careful.为什 F: You should have been more careful about what you ate We do not think that they should have been put to this troub Catherine should have be more careful. I have been through hell.To break the spell 是 We have not been to the Great Wall for ages.No ,I don not re If the captain had been more careful,he could have prevented we have to break up? we will not have enought time to grow more trees to take the we will not have enough time to grow more trees to take the