If 用法对比练习100题1. a) _______ it rains, the game will be played on time.b) _______ I was twenty, I had never been away from my hometown.c) _______ he were here, he couldn’t help us.A. Even ifB. UntilC. TillD. Unless2. a) I’m busy now. If I time, I a chat with you.b) If I time last night, I have a chat with you..A. have, will haveB. had, would haveC. had, should hadD. had had, would have had3. (1)You’ll miss the train __________ you hurry up.(2)You’ll miss the train __________ you don’t hurry up.A. ifB. unlessC. whetherD. as4. (1)_________ it’s raining , they are still working in the field.(2)Young _____she is , she knows quite a lot.(3)We’ll make a trip even if (even though) the weather is bad.(4)__________what happened , we would not mind.A. No matterB. AlthoughC. even ifD. as5. (1)________ this medicine, and you will be all right .(2)________ this medicine, you will be all right .(3)________ this medicine, it will cure you of your illness.A. To takeB. TakeC. TakingD. If you take BC/DD6. (1)It seems he knew nothing about it．(1)It seems he is lying．A. that as ifB. thatC. as ifD. Ｂand Ｃ7. (1)If it ______ tomorrow, I won’t go out seeing.A. rainsB. will rainC. is going to rainD. is raining(2)If you ______ me, I will give you some advice.A. listen toB. will listen toC. listenD. are listening8. (1)If it ______ tomorrow, I won’t go out seeing.(2)If it ______ tomorrow, I wouldn’t go out seeing.(3)Were it ______ tomorrow, I wouldn’t go out seeing.A. should rainB. to rainC. rainsD. rained9. (1)If we work hard, we can overcome any difficulty, no matter ____ great it is.(2)If we work hard, we can overcome any difficulty, ____ great it is.(3)If we work hard, we can overcome any difficulty, ____ difficulty it is.(4)If we work hard, we can overcome any difficulty, no matter ____ difficult it is.A. whatB. howC. howeverD. whatever10. (1)There is only one English-Chinese dictionary in that book-shop. I wonder if you still want to buy ___.A. itB. oneC. anotherD. any(2)Will you see to _________ that my children are taken good care of while I am away?A. meB. itC. yourselfD. them1. (1)It depends on _______ he has enough money.(2)_______the sports meet will be held depends on the weather.A. When everB. IfC. WhetherD. That2. (1)Fran is an honest girl; I say it, ______ I don’t like her.(2)Fran is an honest girl; I say it, ______, I don’t like her.A. even thoughB. as thoughC. even soD. as long as3. (1)Time ______, he shall go outing.(2)If time _____, he shall go outing.A. permittedB. permitsC. permittingD. would permit(1)"When _____ he come?" "I don't know, but when he _____, I'll tell you."A. does, comesB. will, comesC. does, will comeD. will, will come(1)"When he _____ is not known yet." "But when he ____, he will be warmly welcomed."(1)I don't know if she _____, but if she ____ I will let you know.A. comes, comesB. will come, will comeC. comes, will comeD. will come, comes4. (1)Who is it up ______ decide whether to go or not?(2)Who did you go _____ help the people in trouble?A. to toB. for forC. to forD. with to5. (1)_______ from the hill, the park seems beautiful.(2)_______ from the hill, you'll find the park beautiful.(3)_______ from the hill, and you'll find the park beautiful.A. SeeB. SeenC. SeeingD. to be seenE. If you see6. (1)_____ no subjunctive mood, English would be much easier.(2)_____ no subjunctive mood, English would be much easier.A. If were thereB. Were if thereC. Were thereD. Is there7. .(1)If you take five out of eight, three ________.(2)Five out of eight ________ three.(3)Take five from eight and the ________ is three.A. remainderB. remainsC. is remainedD. leaves8. (1) Weather ___, we'll go and pay a visit to your school.(2)If weather ____, we'll go and pay a visit to your school.A. permitsB. permittedC. permittingD. is permitted9. (1)---Do you mind ___ here?--- Sorry, it isn't allowed.A. if I smokeB. smokingC. my smokingD. to smoke(2)It's very cold today. Would you mind ___ the window?A. my closingB. closingC. if I closeD. to close(3)Would you mind ___ for me for f few minutes?A. waitB. your waitingC. waitingD. if you wait20. (1)We don't know he will come unless told．(1)We don't know he will come until told．Ａ．that Ｂ．whether Ｃ．if not Ｄ．how long1. (1)_______, you'd better stop quarrelling.(2)_______, we can't be defeated.A. UniteB. UnitedC. To uniteD. If we unite2.(1)If it ______ tomorrow, I won’t go out seeing.A. rainsB. will rainC. is going to rainD. is raining(2)If you ______ me, I will give you some advice.A. listen toB. will listen toC. listenD. are listening3. 1) She didn't come back __________ her mother went to bed.2) She won't come back __________ her mother asks her to.A. unlessB. ifC. untilD. when4. (1) ______ straight on and you’ll see a church. You won’t miss it.(1) ______ straight on, you’ll see a church. You won’t miss it.A.GoB. GoingC. If you goD. When going5. 1) _________ we shall go for a picnic tomorrow is certain.2) __________ we'll go for a picnic tomorrow is uncertain.A. ThatB. IfC. WhetherD. What6. a) He would have a look at the bookstores________ he went to town.b) We decide to finish the work on time, _______ happens.c) If we work with a strong will, we can overcome any difficulty, _______ great it is.d) I’ll give the book to________ likes English.A. wheneverB. whoeverC. whateverD. however7. a) If it this afternoon, we’ll put off the sports meet.b) If it this afternoon, we would put off the sports meet.A. rainB. rainsC. rainedD. will rain8. a) It’s necessary that you__________ be present at the meeting.b) His father__________ often have a walk after supper.c) I ________ rather sleep than watch TV.d) If it______ rain tomorrow, he would not come.e) You’re late again. You ________ have come five minutes earlier.A. shouldB. wouldC. ought9. (1)It depends on _______ he has enough money.(2)_______the sports meet will be held depends on the weather.A. When everB. IfC. WhetherD. That30. (1)If you _____me, I will give you some advice.(2)If you _____me, I should give you some advice.A. listened toB. will listen toC. listen toD. are listening to1. What would have happened _____, as far as the river bank?(2)What would happen _____, as far as the river bank?A. Bob had walked fartherB. if Bob should walk fartherC. had Bob walked fartherD. if Bob walked farther2. (1) ____ he come, what ____ you say to him?(2) _____ he comes, what _____ you say to him?A. Should…wouldB. When…wouldC. If…willD. Were to…do3. (1)________ this medicine, and you will be all right .(2)________ this medicine, you will be all right .(3)________ this medicine, it will cure you of your illness.A. To takeB. TakeC. TakingD. If you take4. (1)I don't know or not you will help me．(1)I don't know will help me．(1)I know you will help me．Ａ．that Ｂ．if Ｃ．whether Ｄ．who5. (1) _________ we shall go for a picnic tomorrow is certain.(2) __________ we’ll go for a picnic tomorrow is uncertain.A. ThatB. IfC. WhetherD. What6. (1)I have a doubt _______ he will succeed.(2)I have no doubt _______ he will succeed.A. ifB. whetherC. thatD. how7.(1)It’s cloudy. It looks as if it ___________.A. is going to rainB. were going to rainC. would rainD. rained(2)When a pencil is partly in a glass of water, it looks as if it _______.A. breaksB. has brokenC. were brokenD. had been broken8. (1)His idea ____ we should finish the work ahead of time was accepted.(2)His idea ____ we are discussing was accepted.A. thatB. whetherC. ifD. which9. (1)Father promised____ I studied harder he would take me to Beijing next summer.(2)Father promised ___he would take me to Beijing next summer if I studied harder.A. thatB. ifC. that ifD. if that40. (1)Has it been decided________ they will hold the meeting tomorrow?(2)Has it been decided________ they will hold the meeting there?(3)Has it been decided________ they will hold the meeting there tomorrow?A. whetherB. ifC. whereD. when1. (1) It looks ___________ the weather may turn out fine tonight.(2)The chemical teacher said, “do everything __________I do .”A. as thanB. asC. thoughD. as if (as though)2. If time ______, I'll go to see my friend tomorrow.Time ______, I'll go to see my friend tomorrow.A. permittedB. permitsC. permittingD. permit3. (1)If it ______ tomorrow, I won’t go out seeing.(2)If it ______ tomorrow, I wouldn’t go out seeing.(3)Were it ______ tomorrow, I wouldn’t go out seeing.A. should rainB. to rainC. rainsD. rained4. ______ straight on and you’ll see a church. You won’t miss it.______ straight on , you’ll see a church. You won’t miss it.A.GoB. GoingC. If you goD. When going5. (1) ______ we’ll have a meeting tomorrow has been decided.(2)______ we’ll have a meeting tomorrow has not been decided.A. ThatB. IfC. WhetherD. what6. (1)____ sometimes keeps her awake at night ____ Tom is getting more and more quiet athome.(2)____ sometimes keeps her awake at night is ___ Tom is getting more and more quiet at home.A. That; whichB. It; thatC. Whether; whatD. What; that7. (1)This is an illness that can result in total blindness ______ left untreated.(2)______ you want me to fire you, I suggest you stop wearing sports clothes at office.(3)You must keep on working in the evening ______ you are sure you can finish the task in time.A. sinceB. ifC. unlessD. until8. (1)Doctor Godwin says that ___ what forceful arguments against cigarette there are, many people insiston smoking.(2)Doctor Godwin says that _____ forceful arguments against cigarette there are, many people insist on smoking.(3)Doctor Godwin says that _____ happens, many people insist on smoking.A. whateverB. no matterC. howeverD. even if9. (1) It looks ___________ the weather may turn out fine tonight.(2)The chemical teacher said, “ do everything __________I do .”A. as thanB. asC. thoughD. as if (as though)50.(1)---Do you mind ___ here?--- Sorry, it isn't allowed.A. if I smokeB. smokingC. my smokingD. to smoke(2) It's very cold today. Would you mind ______the window?A. my closingB. closingC. if I closeD. to close(3)Would you mind ___ for me for f few minutes?A. waitB. your waitingC. waitingD. if you wait1.（1）We don't know he will come unless told．（2）We don't know he will come until told．Ａ．that Ｂ．whether Ｃ．if not Ｄ．how long2.I don't know or not you will help me．（2）I don't know will help me．（3）I know you will help me．Ａ．that Ｂ．if Ｃ．whether Ｄ．who3. (1)If you take five out of eight, three ________.(2)Five out of eight ________ three.(3)Take five from eight and the ________ is three.A. remainderB. remainsC. is remainedD. leaves4. (1)I doubt ________ he can help you with your English in his spare time.(2)I don’t doubt _______ he can help you with your English in his spare time.A. thatB.ifC. whetherD. what5. (1)If you come here earlier, you _______ the great scientist.(2)If you had come here earlier, you _______ the great scientist.A. are going to seeB. would have seenC. will seeD. would see6. ①I’m sure ______ he finished the task on time yesterday.②I’m not sure _____ he will finish the task on time.A. whetherB. whichC. ifD. that7. ①____ he come, what ____ you say to him②_____ he comes, what _____ you say to himA. Should…wouldB. When…wouldC. If…willD. Were to…do8. a) She asked me whether I was used to________ faces in class.b) She asked me whether I used to________ faces in class.c) Wood was once used to_______ fire in some villages.A. makeB. makingC. madeD. to make9. a) You can have________ second try if you fail this time.b) You can have________ second seat if this one is broken.A. aB. anC. /D. the60. (1)________ doesn’t matter much whether he’ll come to the party.(2)I feel ________ an honour to be invited to speak here.A. this（This）B. it（It）C. that（That）D. what（What）1.2.4.5.6.7.8.9.70.1. ①______ we’ll have a meeting tomorrow has been decided.②______ we’ll have a meeting tomorrow has not been decided.A. ThatB. IfC. WhetherD. what2.3.4.5.6.7.8.9.80.1.2.4.5.6.7.8.9.90.1.2.3.4.5.6.7.8.9.100. ①Father promised _____I studied harder he would take me to Beijing next summer.②Father promised ____he would take me to Beijing next summer if I studied harder.A. thatB. ifC. that ifD. if that。