the night before an exam意思

the night before an exam意思 I can not sleep the night before an exam .the前面不需要加介词吗? before能做引导词吗,在这句I can't sleep the night before an exam是吗谢谢 Sleep well on the night before the exam the night before last的意思 the night before与last night意思相同吗? 英语翻译I can't sleep the night before I take a big exam..Then I I can’t sleep the night before i take a big exam.是不是定语从句 the night before last, befor` can‘t an exam I sleep night the连词成句 The secret___ before an important exam is to tell yourself t happen on the night before-on New Year's Eve,里面的before-on么意思