Again: 又 and 再

"While 又 (yòu) is used for "again" in the past, 再 (zài) is used for "again" in the future. That is, 再 is used when something has happened once and it will happen again." Here is a link and you can read more about 再 referring again in the future. Here is also a good article about comparing “past again" 又 and "future again" 再。

However, " 又 can add emotional coloring to events recurring in the future". For example,

• 什么？今天晚上又吃面条？ What? We will have noodles again tonight? (The speaker might not a big fan of noodles, or he/she is sick of having noodles all the time.)
• 下周又要考试了。We will have a test again next week. 
• 下周我们又可以见面了，我真高兴。We can meet again next week.I'm so happy (about it).
  

Please fill in the blanks:

1. 网页现在打不开，你五分钟以后_____试试。（又 or 再）
2. 昨天她______迟到了。（又 or 再）
3. 欢迎下次______来。（又 or 再）
4. 今天早上______下雪了。（又 or 再）
5. 天气预报说明天______要下雪，你得多加衣服啊。（又 or 再）