最佳答案:爱丽丝不确定自己先说话是否合乎礼仪Alice didn't know whether she talked formally
最佳答案:you go and check whether jack have left or notyou go and check whether jack is
最佳答案:I am not sure how LONG I can hold on, just like whether you still love me. 直翻
最佳答案:1.我们不确定他是否会来.(not sure)We are not sure if he will come.2.学生们正忙着准备下周的考试.(be up to