1. I'm sorry, but our plans to meet up this weekend may fall through due to unexpected circumstances.
对不起，但我们本周末见面的计划可能会因为意外情况而落空。

2. The agreement we had with the supplier fell through at the last minute, so we need to find a new one quickly.
我们和供应商的协议在最后一刻失败了，所以我们需要迅速找到一个新的。

3. I thought I had secured the job, but it fell through after they found someone more qualified.
我以为我已经得到了这份工作，但他们找到了更合适的人后，计划泡汤了。

4. The deal to buy the house fell through because the seller changed their mind.
买房的交易因为卖家改变主意而失败了。

5. We were counting on his help for the project, but it looks like it's going to fall through.
我们指望他帮助这个项目，但看起来这个计划要泡汤了。

6. Don't worry, I will make sure that nothing will fall through this time.
别担心，我会确保这次什么都不会出差错。