gt.brit.

例句：

1. 1. I'm not sure if we should go to the party tonight.
   我不确定我们今晚是否应该去参加聚会。
2. 2. The weather forecast is not clear, so we can't make a decision yet.
   天气预报不清晰，所以我们还不能做出决定。
3. 3. The new policy has not been implemented yet, so we need to wait and see.
   新政策尚未实施，所以我们需要等待并观察。