第一句话对还是第二个对第一句：If Tom fails his exam his dad will be sad.第二句：If Tom fail his exam his dad will be said.急啊……理由

第一句话对还是第二个对第一句：If Tom fails his exam his dad will be sad.第二句：If Tom fail his exam his dad will be said.急啊……理由 请问这两句话哪句是对的,第一句If I had accompanied you to Hong Kong,this would not have happened.第二句If I had accompanied you to Hong Kong,this will not have happened.个人认为是第二局,但又不确定,如果有人知道可以 I'm going to eat more vegetables to keep f__I'm going to eat more vegetables to keep fit.I'm going to eat more vegetables to keep fitter.第一句好（对）还是第二句,为什么? as if He treated the girl as if she were his own duaghter.He treated the girl as if she had been his own duaghter.两句话哪个对的?参考资料上显示是第一句,但是按照as if 的语法使用来说的话应该用第二句才对啊. 两句哪句对?if you know what romance is it called?还是if you know what is called romance.两句哪句对?第一句it 为什么要加？去掉呢？ 受精作用使后代染色体数目加倍.受精作用对生物的变异具有重要作用这两句话中为什么第一句错,第二句对? my mother said that i should work hard .(1)my mother said that i should be work hard.(2)第一句对还是第二句对 谁能帮我解释下为什么第一句话是错的而第二句话是对的? if you want to be part of this world,jenny第一季 第二集blair对jenny说If you want to be part of this world Jenny.People will talk...Eventually.And you need to decide if all this is worth it.我不是说中文意思是blair说这句话隐含着 机械能不变,重力势能和动能可以相互转化重力势能变化,机械能一定有变化,这两句话为什么第一句不对而第二句对? 关于英语从句语法题下面两句话那句是对的?1.I doubt that i can pass the exam.2.I doubt that if i can pass the exam.我觉得是第一句正确吧.that 引导宾从,若里面在套一个if引导的状从,则第二句状从缺少主语. The old man (that i spoke to him )yesterday is a scientistThis is the old man that I talked with him yesterday为什么第一句话错第二句对? 关于哲学真理的问题?第一句话：无数的相对真理总结和构成了绝对真理.第二句话：无数相对真理的总结和构成绝对真理.请问这两句话哪个对,还是都对!两本教材,两种话,哪个对? 特别是对第一句话的说明 I want to know if he _____(come）tomorrow .If he _____（come),i -------(give）the massage to him第一句话为什么是宾语从句,不是条件状语从句啊,if引导的条件状语从句的结构是什么啊,为什么第二句是第一句不 2009年12月大学英语六级 快速阅读 对5个选择 1个填词听力 对17个选择 复合式听写对3个填词,填句子第一句和第三句写出了三分之二 第二句全对阅读 对5个选择 3个填空完型 对9个选择翻译 能拿 第一题是对还是错 第一题是对还是错