indefinite pronoun

例句：

1. 1. I don't know what to do next, so I can't decide on a definite plan.
   我不知道下一步该做什么，所以不能决定一个确切的计划。
2. 2.The weather forecast is indefinite, so we should prepare for the worst.
   天气预报不确定，所以我们应该为最坏的情况做准备。
3. 3.He didn't know which way to go, so he decided to take an indefinite route.
   他不知道往哪个方向走，所以他决定采取一条不确定的路线。