at half past seven为什么前面用at而不用on,in,to

the filmbegins at half past seven 翻译 The film begins at half past seven. Tom and Mike meet at half past seven.(对 at half past seven 提问） I'll get up at half past seven.(变为一般疑问句)____you____up at half past seven? i do my homework at half past seven 划线提问 画half past seven 为什么7:30是half past seven.而不是at a half past seven half past seven, I go to school at half past seven. 是什么意思 I get up at half past seven .(改为一般疑问句) Shall we s____ at half past seven?---Ok at I past half get up seven.连词成句 At half past seven l c______ a train. Simon has breakfast at half past seven.{对划线部分提问}划线划在at half past seven下 let's meet at half past seven 同义句改成＿＿＿＿ ＿＿＿＿ ＿＿＿＿ at half past seven? we should arrive at school at half past seven in the morning 同义句 2句 at half past seven为什么前面用at而不用on,in,to at half past six at half past