为什么7:30是half past seven.而不是at a half past seven

为什么7:30是half past seven.而不是at a half past seven half past half past -What time do you usually get up?-I usually get up ——A.half past six B.half to six C.half after six选哪个啊 为什么、、thirty to six 的意思是 5：30 还是5：00 At half past six是何意思? half past seven是几时几分 half past five是4点半? make it half past 是九牛二虎之力吗? half past three ,这里half是名词不? Let's make it half past six.为什么half past six前面不加at ---when do you usually go to bed at night?----at ( ) eleven.half past,a half past,half hour pasta half hour past,为什么选a 英语表达时间的疑问,It is half past ten or It is a half past ten?“现在是10：30”应该是“It is half past ten”还是“It is a half past ten”?我觉得应该是前者,今天一个老师说是后者,必须得有a,是这样吗, the party starts at half past ten 为什么加Sthe party starts at half past ten start为什么加S You must be home at half past ten.为什么要用be,be是在什么情况下用的? at half past six 什么时候用half past it 's half past half past seven,