donesn't have 可以用hasn’t 替换么?

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• I have been dreaming.That's why I didn't see.That's why可以用so来替换吗?That's why的原形,
• 虚拟语气中,句中could如果是肯定形式,那么表示是虚拟语气；如果是couldn't,即其否定形式只能表示推测请问,是这样的么.老师上课是这样讲的,可是我做题发现好像讲的不对.2011年陕西高考题 I____through that bitter period without your generous help.A couldn't have gone B didn't go C wouldn't go D hadn't gone.答案选择的是A,这不就是couldn‘t 用在虚拟语气中么,难道不是这样的,纠结.我就是因为知道选A,才对老师的讲解有疑问,这道题只不过是我举得一个例子而已,我知道选A.我想知道的只有一个,couldn't 即could否定形式可不可以用在虚拟语气中?
• 虚拟语气中,句中could如果是肯定形式,那么表示是虚拟语气；如果是couldn't,即其否定形式只能表示推测请问,是这样的么.老师上课是这样讲的,可是我做题发现好像讲的不对.例如,2011年陕西高考题 I____through that bitter period without your generous help.A couldn't have gone B didn't go C wouldn't go D hadn't gone.答案选择的是A,这不就是couldn‘t 用在虚拟语气中么,难道不是这样的,纠结.我就是因为知道选A,才对老师的讲解有疑问,这道题只不过是我举得一个例子而已,我知道选A.我想知道的只有一个,couldn't 即could否定形式可不可以用在虚拟语气中?另外,这句话绝对是虚拟,是对过去时态的虚拟,而且是含蓄条件句中的一种,也就是有事假设的条件不通过条件从句表现出来,而是暗含在上下文或without,otherwise,but for等引出的短语中.翻译成,要不是你
• unless 与if not帮我分析一下例句：I'll be surprised if he doesn't have an accident.（这句可以用unless来换么?为什么）I'll be back tomorrow unless there's a plane strike.(为句可以用if not来换么?为什么）unless=if not,怎么区分他们的用法?
• Don't mention it./Forget it./Don't say so.意思和用法可以用来回答感谢和道歉么?——Sorry to have hurt you.——________.You didn't mean to,did you?A.Forget it.B.Not problem.C.All right.D.Don't say so.
• What he said is only partly right,I mean,I don't agree with him all.这里的I mean 可以用that is替换么?
• donesn't have 可以用hasn’t 替换么?
• hasn't your friend arrived yet?how long have you had to wait?i have had to wait for two hours!你朋友到了吗?你等多久了?这里had to不得不不用翻译吧?我已经等了2小时了!是这样翻译么?do we have to walk to the station?我们一定要走着去车站吗?
• What he said is only partly right,I mean,I don't agree with him all.这里的I mean 可以用that is替换么?
• I have been dreaming.That's why I didn't see.That's why可以用so来替换吗?That's why的原形,That's why是短语吗？
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• 我的电子天平300KG,分度值为50g,先用标准5KG的砝码称量,电子天平显示值为5.00还是4.95呢?