是的,by the end of意思是到……结束时;到……时为止;在……之前
到……末了为止(已经完成了某事)
at the end of是 在……尽头;在……结束时
在……的末梢 不含完成之意
My friends are planning another trip to Alishan at the end of the month.
我的朋友们在计划另一个旅行这个月末到阿里山去.
By the end of this month,he said,the United States will have brought home more than ninety thousand troops.你的意思是说by the end of时态用完成时,at the end of用一般时?嘿嘿通常情况下都是