已知椭圆的两个焦点分别为f1f2

过去式smelt smoke catch,smoke,bow的过去式,现在分词,三单,固定用法? That is why＋句子 那是…的原因 Why is me?为什么会有这样没有主语的句子?我记得上中学时学过,每个句子里都要有主语的啊忽然想起来这个么句子 Why is me?这个句子怎么没有主语?为什么是我?me是宾语,is 是系动词,那主语跑哪 he left us in a car accident on his way home to his wife and infant daughter 这句话该怎么翻译 该句子为何用is?为何加be?Everybody is welcome to be present at the contest. my dear I think you are No.1 I love you forever I hope you my dear I think you are No.1 I love you forever I hope you happy every day the teacher often tell the children（）football on the street.我对四个选项都很模糊请好心人帮忙一一分析下!Anot playBnot playingCnot to playDdon’t play i often saw the children () football.A,play B,playedC,playingD,to play There is not enough space available on the disk(s) to complete this operation硬盘未分配的空间,不能分配?怎么办? 键还原The available space is not enough 怎么回事 The decompression of %s failed.There may not be enough free disk space available in the TEMP directory.这句话是我在安一个软件时,弹出来的．软件也安不了了．似乎是没有解压的空间什么的．哪位有识之士能告诉 It is being investigated.这句话有错吗? what has hands and a face,but does't wash its face?英文谜语,什麽东西有手和脸,但却从来不洗脸? Which is being built.这句话有正确吗?它有两个谓语动词is与being啊 the number of foreign students attending chinese universities has been rising steadily since 1997为什么用has been trust is being put in them里的being为什么不改成been?不是BEEN是被动语态吗? the number of foreign students attending chinese universities ———— rising stesding since 1997为什么用has been [周报1期T10] The number of foreign students attending Chinese universities _____risingsteadily since 1997.A.is B.areC.has been D.have been 为什么选C而不选D?请详细分析. ___of foreign students coming to China for study is rising .A A number B THe number C Number DA lot the young pioneers are carrying water for granny(用often改写）my mother often washes at home （用last week 改写）yesterday my mother ahd i shopped in a shop （变否定句)her uncle lived in shanghai two years ago(变一般疑问句）请 when i came in ,i found your teacher staying in the classroom 的同意句······咋改啊when i came in ,i found your teacher【 】 【 】in the classroom How can you make me trust you Trust me I can make it翻译 穴字头下面一个手什么字 一个方一个人什么字 要怎么打怎么打 a number of the students 单项选择.A number of students _____ from the US.A.is单项选择.A number of students _____ from the US.A.isB.areC.comesD.was Bill does his homework at home用Tomorrow改写句子Bill ＿ ＿ ＿do his homework tomorrow Bill does his homework at home.(用tomorrow改写句子）Bill （ ） （ ） ( ) do his homework tomorrow. you can do it和you can make it都可以表达“你会成功”的意思吗? 结合具体作品阐述欧洲文艺复兴人文主义思想的具体表现,并与当今时代相联系,说明人文精神的重要意义 英语翻译这段话的前文如下：是讲在签订自由贸易协定的时候,是应该保护本国的弱势企业,还是将其放逐于自由贸易中的激烈竞争中自生自灭.（请结合前文翻译...）