求x2e-x的不定积分

help sb doing sth和help 英语翻译(1)I think we will be able to travel faster and safer around the world and into space.(2)Now we have to press a key or type a word to make a machine work. How do you think you will travel to work in 15 years' time?什么意思? How long will you be able to come back from you travel be going to be和be going to do有什么区别?用英语说,要翻译…… when time had finish i went and bought another time thinking i will be able to cacth u back .. 英语:Are you going to use any books?翻译成中文 英语连词成句并翻译are you going how to get these 英语填空today we are going to learn U_____ Threetoday we are going to learn U_____ Three.we m____ to get there in time. are you going to learn english?改间接引语改后为Tom asked me whether I was going to learn English.为什么是was 而不是am? a,put,I,some,pot,in,seed连词成句 ----How are you getting along with your English study ----So far ________.A.so well B.as well C.quite well D.so good为什么选D 其他选项错拿了 How are you getting on with your English?怎么回答?题目是这样的,给出的回答是Quite well,thank you!要求选问句选项有A.How are you getting on with your English?B.What do you think of it?答案选的是B,不知道A是不是也可以 how are you getting along with your studies 为什么用 getting? They can cee some birds and flowers in the park(变成否定句) In ____winter,it is cold and snowy.A.aB.anC.theD.\ it's (cold and snowy) in winter in harbin.对括号部分提问 it is cold and snowy today .cold and snowy 划线 对划线部分提问 It’s cold and snow in winter in New Zealand.用snow 还是snowy did you _____your lost pen?A.look for B.find C.looked for D.found looked for和find与find out以及found和look for都有什么区别?详细说明都分别用在什么地方!（最好举个例子）明天月考,老师说这是重点! i've looked everywhere,but i haven't found any black ink.Then,i'm afraid there is ___left.A nothing B none请问这里不能用nothing的原因是什么呢? I lost my keys ,I have ___(looked,looked for,found,founf out) it everywhere 用we ,in the garden,some,in spring,flowers,grow,often造句子 why did she grow some flowers in the garden为什么用some而不是any My brother can ___.So he wants to join the ___club.My brother can ___.So he wants to join the ___club. A:swims;swimmingB:swim;swimmingC:swim;swim small fry怎么玩 small fry 怎么玩 I was actually small fry are home to a beloved woman.是什么意思 ---I haven't seen Ling Feng for a long time.---He___to Sydney.(go)正确答案是has gone,可是我搞不懂这种前面是have的某些形式,后面跟动词过去式的语法, Where is her second son?I haven't seen him for a long time.He __Maine looking for a place to work这题时态填has gone to呢还是had gone to?我也认为是现在完成时，但答案却是had gone to ,这还是一道中考题，难道是答案错 The man（）some rice last weekend.grow grew growed选择