doing和todo用法区别

为啥奥运会英国有GBR(Great Britain)而不用UK,北爱尔兰不参加吗 he always borrows money from his friends and never pays it back.为什么borrows和pays后面加s he always borrows money from his friend and never pays it back 中的it指什么?可以省略吗? He,.,always borrows money from his friends and never pays it back. A,however B.no matter 怎么翻译 Or so say scientists from Australia and Canada in the online edition of the Proceedings of 故乡家怎么样 家家乡怎么样 关于家乡的作文家我的家乡在孟庙边 I have a grammar problem here.A detailed explanation will be highly appreciated.These challenges arose simultaneously and interrelatedly in each of the political-security,econmic,and North-South domains.In each field they offer some immediate threats He always helps his brother ____his homework.A do B with我知道help sb （to）do =help sb with sth希望大家帮帮忙, l want to go to ( Beijing)对括号里面的提问 The search proved difficult和The search proved to be difficult有什么区别? i don t want 英语翻译 The search proved difficult.这句话为什么不用被动语态这句话为什么不用被动语态?如果用被动在proved前面加个was就可以了吧 the search proved difficult ,这句话是怎么回事?difficult不是形容词吗?为什么可以这样用啊? The search proved difficult,为什么不是The search was proved difficult?the search 不是应该“被”证明很有难度吗?应该用被动语态才对? 我们家一年吃很多次鱼,用英语怎么说 很多鱼的时候用英语说它们正在做什么怎么说 struggle for that freedom中的that怎么解释 这里的...tape from their house...句怎么译啊? sit at the table是什么意思?为何用at Henry always bothered others with s____ questions.How stupid! 填词 The boy is always c_____ about others,so he can't get on well with others. want to do Sth want to do sth、的意思 Are you stronger than your feiend【做肯定回答】 Are you more outgoing than your sister?【做肯定回答】 给我想个日记素材谢谢 进新家有什么祝福语 朋友家小孩满月酒,红包上应该写什么祝福语,是男孩 急, soft leather是什么意思