NOT element

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.She didn't expect that he would come back so soon.
   她没想到他会这么快回来。
3. 3.Not at all, thank you for your help.
   一点也不，谢谢你的帮助。