在不在英语怎么说

在不在英语怎么说：How to say whether or not in English

我不确定他在不在家。I'm not sure whether he is at home or not.

你要不要跟我们一起去看电影？Do you want to come with us to see the movie or not?

明天会不会下雨还不确定。It's still uncertain whether it will rain tomorrow or not.

我们需要确认他是否已经完成任务。We need to confirm whether he has completed the task or not.