whether 和if 的区别？ I don't know if your mother is all right 这句话在语法上对吗？
第一空 whether和if 皆可 因为这里引导的是宾语从句 而他们两都能引导宾从
第二空 填had
顺便给你说一下whether和if的区别：
whether和if的用法区别 1)whether和if常用来引导宾语从句，这时两者的含义区别很小，一般可通用。例如： ①I don't know whether/if they will come to help us. 我不知道他们是否来帮助我们。 ②I am not sure whether/if I'll have time to go with you. 我很难说我们是否有时间跟你们一起去。 上面两句无区别。但是，当whether与or not连成一个词组时，whether不可换用if。例如： ③I don't know whether or not they will come for our help. 我不知道他们是否要来求我们支援。 【注意】若whether和or not不连在一起，在日语中可以用if取代whether，当然也可以用whether。例如： ④I am not certain if/whether the train will arrive on time. 我没有把握火车是否准时到达。 ⑤I don't care if/whether your car breaks down or not. 我不在乎您的车是否是会出故障。 此外，还有三种情况值得注意： (1)在介词后面只能用whether，不能用if。例如： ①This depends upon whether we are determined to do it. 这件事要看我们是否有决心去做。 ②It depends on whether he is ready. 这件事要看他是否有准备。 ③I am not interested in whether you'll come or not. 你来不来我不感兴趣。 ④We haven't settled the question of whether we'll renew our supplies of coal for factory. 是否要为我们工厂补充一些煤，这个问题我们还没有决定。 (2)在动词不定式之前，只能用whether，不能用if。例如： ①He doesn't know whether to stay or not. 他不能知道是否要留下来。 ②She doesn't knows whether to get married now or wait. 是否现在结婚或是等待她不知道。 (3)在及物运动discuss后的宾语从句中，只能用whether，不能用if。例如： ①We discussed whether we should make a change in our plan. 我们讨论了是不是要对我们的计划作一些修改。 ②We were discussing whether we should discuss the business with them. 我们正在讨论我们是否要和他们谈这个生意。 2)引导主语从句时，只能用whether，不能用if。例如： ①It is unknown whether he will come. 他是否来还不知道。 ②Whether the news is true remains a question. 这个消息是否真实仍然是个问题。 3)引导表语从句时，只能用whether，不能用if。例如： ①What we want to know is whether he will come to speak to us tomorrow. 我们想知道的是他明天是否来给我们讲话。 ②The question is whether they can take our advice. 问题是他们是否能接受我们的意见。 4)引导同位语从句时，常用whether。例如： ①The question whether we'll build another lecture building hasn't been settled. 是否要另建一幢教学楼的问题还未决定。 ②The question whether he'll come is unknown. 他是否来的问题还不知道。 5)可以用来引导一个否定的宾语从句，whether则不能用来引导否定的宾语从句，因为它表示正反两方面的选择意义比较强。例如： ①Tell me if it is not going to rain, please. 请告诉我明天是否不会下雨。 ②He considered if he shouldn't tell her the secret. 他考虑他是否不该告诉她这个秘密。 6)if除引导宾语从句外，还可以引导条件状语从句，作“是否”解。在容易引起混淆产生歧义的情况下，就不可用if，而须用whether。例如： ①Please let me know if you intend to come.这个句子有两种解释： A：“请让我们知道你是否想来。” B：“如果你打算来，请让我们知道。” 第一种解释是把if引导的从句看作宾语从句，把动词know视为及物动词(vt．)；第二种解释是把if引导的从句当作条件状语从句，把动词know看作不及物动词(vi．)。 在口语中，我们可以通过语调来表示两者的区别；但是，在书面语中，无上下文(如一张便条上写着这句话)，那就含混不清了。如果我们想表达的第一种含义，就得用whether来改写第一句。 ①Please let me know whether you intend to come. 又如： ②Let me know whether he has left for Shanghai. 告诉我他是否已经去上海了。 ③Let me know if he has left for Shanghai. 如果他去上海，请告诉我一声。此外，whether还可以引导让步状语从句，作“无论、不管”解，这儿就略而不谈
三只小猪
There are three little pigs。 They live in a small house with their mother。 "This house is too small。 The three of you must leave home。 You must build your own homes，" says the mother pig one day。
有三只小猪。他们跟猪妈妈同住在一间小屋子里。有一天猪妈妈说：“这房子太小了。你们三个必须搬出去住。你们必须自己盖房子住。”
The first little pig gets some hay。 "I will build a house of hay，" he says。 "It will not be hard。 My house will be easy to make。 Then， I will go play。"
第一只小猪拿了些干草来。“我要盖一间草屋，”他说。“这工作不难。我的屋子很容易盖。盖好后，我就可以去玩耍了。”
"I will use sticks to make a house，" says the second little pig。 "It will be easy。 Then， I will go play with my brother。" The second little pig quickly builds his home。 He goes outside to play。
“我要用树枝盖一间屋子，”第二只小猪说。“这工作很容易。盖好后，我就可以跟哥哥去玩耍。”第二只小猪很快就把他的屋子盖好，便到外头去玩耍了。
" I will build my houseof bricks。 It will take a long time，" says the third little pig。 He builds his house。 It is hard work， but the house is strong。
“我的屋子要用砖头来盖。这要花上很长的时间，”第三只小猪说。他便盖起屋子，这工作不轻松，不过屋子却挺牢固的。
One day， the three little pigs see some footprints。 They are the big bad wolf's footprints。 The little pigs run to their homes。 They are afraid of the big bad wolf。 He eats little pigs。
有一天，三只小猪看到几个脚印，这是大野狼的脚印。三只小猪赶紧跑回各自的家里。他们很怕大野狼，因为他会吃小猪。
The big bad wolf goes to the first little pig's house。 The house is made of hay。 "Little pig， little pig， let me come in！" says the wolf。
大野狼走到第一只小猪的家门口。这间屋子是干草盖的。”小猪，小猪，让我进来！”大野狼说。”
"No way！ I will not let you in，" says the little pig。
“不行！我不会让你进来，”小猪说道。
"If you don't let me in， I will blow your house down！" says the wolf。 The wolf blows hard。 The house falls down。 The first little pig runs away。 He runs to the second little pig's house。
“你若不让我进来，我就要把你的屋子吹倒！”大野狼说。于是他猛力一吹屋子就倒了，第一只小猪便连忙逃走。他跑到第二只小猪的家里。
The second little pig's house is made of sticks。 The first little pig and the second little pig are in the house。 They are both very afraid。
第二只小猪的屋子是树枝盖的。第一只小猪和第二只小猪都待在屋内，他们都很害怕。
"Little pigs， little pigs， let me come in！" says the wolf。
“小猪，小猪，让我进来！”大野狼说。
"No way！ We will not let you in，" say the two little pigs。
“不行！我们不会让你进来！”两只小猪说道。
"If you don't let me in， I will blow your house down！" says the wolf。 The wolf blows down the second little pig's house。 The stick house is easy to blow down。 The two little pigs run to the third little pig's house。
“你们如果不让我进来，我就要把你们的屋子吹倒！”大野狼说。于是他就把第二只小猪的家吹倒了。这间树枝造的房子很容易就被吹倒。两只小猪便跑到第三只小猪的家里去。
The wolf goes to the third little pig's house。 The house is strong。 It is made of bricks。 "Little pigs， little pigs， let me come in！" says the wolf。"No way！ We will not let you in，" say the three little pigs。
大野狼来到第三只小猪的家门口。这间屋子很坚固，它是用砖盖的。”小猪，小猪，让我进来！”大野狼说。”不行！我们不会让你进来，”三只小猪说。
"If you don't let me in， I will blow your house down！" says the wolf。 The wolf is hungry。 He wants to eat all of the three little pigs。 He blows and blows and blows and blows， but the house cannot be blown down。
“你们若不让我进来，我就把你们的屋子吹倒！”大野狼说。他肚子饿了，想要把这三只小猪全都吃掉。他吹了又吹，可是这间屋子就是吹不倒。
The wolf is angry。 "I will get all of you，" says the wolf。 He climbs on top of the house。 He goes down the chimney。 The third little pig makes a fire。
大野狼很生气。”我要把你们全部抓起来，”大野狼说。他爬上屋顶，再从烟囱爬下来。第三只小猪生起火来。
"Owwwwwwwwww！" cries the wolf。 The fire burns the wolf， and he runs away。 The three little pigs never see him again。
“哎哟！”大野狼大叫一声。火烧到大野狼，他便逃走了。三只小猪再也没看到他了。
The next day， the third little pig helps his brothers。 He helps them build houses。 They all build houses of brick。 It takes a long time， but no one can ever blow their houses down。
第二天，第三只小猪就来帮他两个哥哥。他帮他们盖屋子，他们盖的是砖房。这很花时间，但谁也无法吹倒他们的屋子了。
The wolf runs far away。 He doesn't eat little pigs anymore。 It is too dangerous。
大野狼跑掉了。他再也不吃小猪了。吃小猪太危险了。
拓展资料：
三只小猪纯英文版
In a remote mountain village and lived a mother pig and her three cute little pigs. Mother every day, the pig hard up, still can be do nothing.
One evening, after dinner, a mother pig to the children before sheepishly said: "you have grown up, should live independently, so you cover themselves behind the move away.
The three little pigs who also don't want to move out to yourself, and building a house, can listen to your mother. Hence, they start wondering what kind of house. Boss first.
First, he carried to many straw, chose a glade in the middle, and made a summary of the house with straw, then a bundle of grass. "Ha ha! I have my own house!" Eldest brother joy trappings.
The boss moved into his new home, the second and third curious visitors. Second, said: "the elder brother, you see youngest house, too simple, I want to build a beautiful, comfortable house!"
Second run to cut back on many wood sawing wood sticks, and, as to a stop. Soon, the second is built their wooden house. Apparently this is beautiful, the eldest brother to much fruit.
Second quickly moved to their new lives, eldest brother and three is visiting. Eldest brother, my house is too simple, Old three say: "I see after the house will also cover the better."
Third anniversary, and finally decided to return home to build a house of old brick, because the house is very strong, do not be afraid of the wind, but it takes many efforts!
Every day in and day out a third trip to move back to a piece of rock, piled up at the side, then a bone-by-bone build by laying bricks or stones becomes a wall. Brother in a fun way: "only a fool will do!"
I still preponderance, to work day and night. Brothers rest, he still kept dry. So for three months, three new house also finished! He's so happy!
One day to a big, bad Wolf. Eldest brother panic hide into the house of straw he. "Hey hey" Wolf to sneer at the two sound, tone blew mercilessly with straw house down. Eldest brother had to run.
Eldest brother ran straight into the second son home runs and shouted: "two brother! Open the door! Help!" The second son opened the door, a big Wolf came after, let eldest brother into the house, the door.
The wolves to stops, thought: "do you think I can be hard wood house?" He hit a door to go. "Hua" a sound, wood house was knocked down.
The brothers and desperately fled to the youngest, breathlessly told old three what happened. Old three first, then the door shut with assurance said: "don't be afraid! No problem!"
Standing in front of the gate big Wolf, he knew the house has three little pigs, but don't know how to get in. He can return to the old, the door shout blow.
A Wolf, he forced to hit. "When a Wolf, only two eyes to see stars, house, refused to budge. The Wolf really nasty, turned to find the hammer.
BieZuJin, with big Wolf down the hammer, broken, hammer hammer old rock-hammer damn near worn down on the rebound, head of the Wolf. "Killing me!" The Wolf Shouting. He really has no skill can.
Wolves have smiles on three little pigs to please go outing. The three little pigs is very clever, also very unity. They advance to the outskirts picked lots of apples. Soon, the Wolf.
The three little pigs according to climb the tree quickly. The Wolf puzzled to ask: "you in that tree?" Old three replied: "we are eating apples! Do you want to come?"
The Wolf, tasty mouth watering readily promised. Three big apple picking a cast down, down the hill under apple rolling is far behind, wolves in the chase, running away. The three little pigs seized ran home.
The Wolf flustered and frustratedly returns, he turned around the house, finally climbed the roof, he wants to slip through the chimney. Three out of the window, and immediately find lit fires.
The Wolf into the fire, smoke inside, whole tail are burned. He howled and its tail between its legs escaped, dare not to find the three little pigs trouble.
whether和if的用法区别
whether与if作“是否”讲，在用法上有相同之处，也有不同之处。
一、相同之处。
1.whether和if都能引导宾语从句，常置于see,ask,learn,tell,wonder,doubt,find out等动词之后。
如：He asked me whether/is I could help him. I want to know whether/if he lives there.
2.whether和if都可用it作形式主语从句中。如： it's uncertain whether/if he'll come this evening.
3.在be uncertain/doubtful之后，常用whether引导宾语从句，有时也可以用if，如： We are uncertain whether/if Mary will come.
二、不同之处。
1.whether可置于句首引导主语从句，而if不能。如： ___the 2000 Olympic Games will be in Beijing is not known yet. A.whether B.If C.Whether D.That 答案是C。
2.whether可用在介词之后，引导宾语从句，而If则不能。如： Success depends on whether we make evough effort.
3.whether可引导表语从句，if则不能。如： The puestion is whether it is not worthdoing.
4.在名词之后引导同位语从句时，用whether而不用if。如： The puestion whether the students answered correctly should be decided by the teacher.
5.whether后可接不定式，而if不能。如： Please tell us whether to go or stay here.
6.在有些动词（如discuss）之后，只能用whether，而不用if引导宾语从句。如： We discussed whether we should close the shop.
7.在引导否定概念in宾语从句时，只能用if，而不用whether.如：he asked me if I hadn't finished my work.
不对
1） 在引导主语从句时，一般用whether，而不用if。
例如 Whether the German engine was the first to fly is not clear.
并不清楚是否是德国发动机首先用于飞机的。
备注 在口语中，if也可以用于主语从句，但必须放句尾，看似是个宾语或表语从句。
2） 在引导宾语从句时，一般情况下whether和if可以通用。
例如 The policeman asked if / whether I had seen the accident.
警察问我是否看见这场事故。
3） 只用whether的情况
例 1 He asked whether I wanted to go by air or by sea.
他问我是想坐飞机还是坐船去。
（从句中含有or，强调选择，这里只宜用whether）
例 2 He asked whether or not I wanted to insure my luggage.
他问我是否想给行李保险。
（只有whether后面可以直接跟 or not）
例 3 Bill asked whether, if I got the job, I’d move to New York.
比尔问我如果找到工作，是否要搬到纽约去。
（宾语从句中包括一个if从句，则宜用whether）
例 4 We discussed whether we should go there.
我们讨论了我们是否应该去那里。
（在discuss等动词后，只能用whether）
参考资料：http://www.hqjenglish.zj001.net/misc.php?xname=VV82FV0&dname=T1H4IV0&xpos=0&op=print
这句应该没有问题。
楼上的总结比较全面。应该说如果在拿不定的情况下，用whether是最安全的。
whether 用在否定中，if 不
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