What’s that?可否用that is来回答?用It is 还是that is回答更合适?

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• What’s that?可否用that is来回答?用It is 还是that is回答更合适?
• my favourite food is egg/eggs.是用egg还是用eggs?在问what's your favourite food?回答时是用my favourite is egg.还是my favourite food is eggs?
• who用单数第三人称吗?如果不知道主语的单复数,who后面用原形还是单数第三人称?比如“谁想和我唱首歌?”是用“Who want to sing a song with me?”还是“Who wants to sing a song with me?”类似的,在不知道单复数的情况下,特殊疑问句里的动词用哪种形式?比如“里面有什么?”“What's in it?”“What are in it?”都可以用吗?或一般用哪一种?如果下文出现的是复数呢？比如第二句回答“There are some pens in it.”那么前面仍用单数吗？
• what's the price of 后加复数 回答用it's 还是they are例如 what's the price of the apples? 回答用 it's 还是 they are ?
• what's in the pencilbox?回答时用There is a pen.还是 It's a pen.并解释为什么.
• 英语教师进!①It's important to have a healthy lifestyle.能不能把It改成this.就是问that this it 这三者怎么用.说不清楚,能理解就行了.比方说That sounds good.可否换成It sounds good.希望有高人明白!②First I ···· 和At first I ···.就是说first 和at first的区别!③hardly ever 和hardly的区别,之前查过,回答的都没多大意思!希望有英语教师来帮忙!④I have a cold 那We have (a) cold(s)是?先是这些了,下星期月考,
• 0,经计算,f(0.670)请回答更针对我的问题一点，" target="_blank"> 关与方程的近似解的两个简单问题（同济高数4版的例题）有书的可以看下P219 例1和P222 例2例1：用2分法求 f(x)=x^3+1.1x^2+0.9x-1.4的实根近似解,使误差不超过10^-3,（定义域为正负无穷.）在求根的隔离区间[a,b]时,书上说：由f(x)=-1.40,取a=0,b=1.[0,1]即是一个隔离区间.这里的0和1是怎么来的啊?是令f(x)0求出来的还是乱猜的?例2：用切线法求 f(x)=x^3+1.1x^2+0.9x-1.4的实根近似解,使误差不超过10^-3,（定义域为正负无穷.）最后已经求出了x4约为0.671,书上说：f(xi)(i=0,1,...)与f"(x)同号,知f（0.671）>0,经计算,f(0.670)请回答更针对我的问题一点，
• 关于what's up的回答因为有“最近怎么样”的意思可以用fine good ok等等回答也可以当做hello回对方what's up平时怎么分辨是哪个呢?还是说2种回答都可以
• the dogs greedily devoured what was left of the cake.这句话中的what was left of the cake是被动语态吗? 而且这里的of the cake这用法我不是很明白,求解释这句子可以改成这样吗?the dogs greedily devoured the left cake  动词加ed可以作形容词用,但是leave不能加ed,所以我用过去分词的形式,请问动词加ed的形式是所有动词都能用还是只是部分动词而已the dogs greedily devoured the cake which was left by people 这句这样写有问题吗?还有一个问题,greedily devour 这副词 “贪婪地” 来修“饰狼吞虎咽地吃” 总感觉有点奇怪,请问他这样些是课文的需要还是外国人本身就这样写 用一个夸张的副词来修饰一个夸张的动词, 直接写成greedily eat不好吗           求解释 感谢回答!
• what's one and two 回答时用单数还是复数形式?
• the way I study English这个里面的定语从句的先行名词为什么可以省去?不是只有that才能省吗?
• 关于what is it that和how it is that强调句的疑问句到底是What is it that.还是What it is that.The questions that puzzled them is ___ they can win.A how is it that B how it is that老师说选B 为什么