make it half past eight为什么具体时间之前不加介词at?

Let's make it half past six . let's make it half past one make it half past 是九牛二虎之力吗? Let's make it half past six.为什么half past six前面不加at it 's half past it's half past It's half past it’s half past Let's make it half past six.make在这儿当什么讲? it's half past five finishes it at half past It's half past four. It's half past eleven. it's half past eight. 英语翻译when shall we meet?let＇s make it half past six Let's make it half past six.的意思是不是让我们6点半做她? Let's make it half past seven中为什么时间前不用at make it half past eight为什么具体时间之前不加介词at?