1._____they wanted to go out,they could always count on me to stay with baby.B.If C.On condition that if=On condition that 但为什么只能用If?2.The train leaves at 6;00 pm.So I have to be at the station______5:40pm at the latest.A.until B.C.by

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1._____they wanted to go out,they could always count on me to stay with baby.B.If C.On condition that if=On condition that 但为什么只能用If?2.The train leaves at 6;00 pm.So I have to be at the station______5:40pm at the latest.A.until B.C.by
1._____they wanted to go out,they could always count on me to stay with baby.
B.If C.On condition that
if=On condition that 但为什么只能用If?
2.The train leaves at 6;00 pm.So I have to be at the station______5:40pm at the latest.A.until B.C.by
两者都是直到,但为什么只能用by?

1._____they wanted to go out,they could always count on me to stay with baby.B.If C.On condition that if=On condition that 但为什么只能用If?2.The train leaves at 6;00 pm.So I have to be at the station______5:40pm at the latest.A.until B.C.by
1、if 是“如果”的意思,表示假设某种情况,这个句子的意思是“如果他们想要出去,可以叫我替他们看孩子”；
而 on condition that 在多数情况下是“只要”的意思,通常不放在句首.如：You can use the bicycle on condition that you return it tomorrow.只要你明天归还,自行车你可以拿去用.这道题用的是虚拟语气,明显是表示假设的,所以用if.
2、until 用于肯定句时,句中谓语动词常表示持续性动作,句意为“持续性动作到……（时）为止”She went on reviewing chemistry until（或till）after 12 o’clock at midnight.她持续复习化学直到半夜12点以后.
这道题中,i have to be at the station,我得到达车站,“到”的动作只是一时的,不是持续的,所以不用until.

第一句,if 和 on condition that 都表示的是如果.....,区别在于两者有位子限制,当if引导条件状语从句时候可以放在开头也可以放到句子中间引导后面的从句,但是on condition that只能放在句子当中连接因为空在句子开头所以选择if.
第二句:by指的是点时间,前面动作不具备连续性,而until表示的是动作的延续.当你到达车站只是一个不延续动作,不可能说我一直...

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第一句,if 和 on condition that 都表示的是如果.....,区别在于两者有位子限制,当if引导条件状语从句时候可以放在开头也可以放到句子中间引导后面的从句,但是on condition that只能放在句子当中连接因为空在句子开头所以选择if.
第二句:by指的是点时间,前面动作不具备连续性,而until表示的是动作的延续.当你到达车站只是一个不延续动作,不可能说我一直在到达车站啊,但是可以说我一直没睡觉.所以第二个也选择by.

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on condition that是以...为条件。You can borrow my car on condition that you bring it back.
这里应该是如果的意思，用if.这两者是不同的。
这里是到某个时间点的意思，不是直到....。只能用by

用am/are/is/am not/isn't/aren't 填空:_____they my pens? _____they will come hasn't been decided.为什么不填whether? 1.I like your pants._____they new?A.Is B.Are C.am2._____hat is this?A.Who B.Whoso C.Who's3.I_____have a basketball.A.isn't B.not C.don't 1._____they wanted to go out,they could always count on me to stay with baby.B.If C.On condition that if=On condition that 但为什么只能用If?2.The train leaves at 6;00 pm.So I have to be at the station______5:40pm at the latest.A.until B.C.by 改宾语从句 急1.why didnt he obey the rulesshe wanted to know_________________she wanted to know why he hadnt obeyed the rules 为什么不是这个 Greens must have been to Shanghai ,_____they?A.hadn't B.didn't C.can't D.weren't还有haven‘t they They don't leave _____they have to do something else.A.because B.so C.but D so that 有关情态动词的：1.Mr Black ,many customers want to see you._____they wait here or outside?A.will B.shall C.can Dwould2.The woman you saw in the supermarker____be Mary.She is in hospital naw.A.can't B.needn't C.shouldn't D.mustn't3.You_____ be The Greens must have been to 2010 Shanghai Expo,_____they?A.hadn't B.didn't C.can't D.weren'tD 题干中算不算有明确时间啊? she said she wanted to do her homework at home and _____ go to the party 1.didn`t 2.won`t3.wouldn`t 4.doesn`t 改成被动或主动句.1.Do people use Chinese only in China?1.______Chinese _____only in china?2.They didn't visit the city two years ago.2.The city _____ _____ _____them two years ago.3.Where did you make them 3.Where _____they ______?4.She was s 再把句子( )1.Amy spends about half _____hour _____day doing her homework.A.the;every B.an;the C.a;every D.an;a( )2.He_____doing homework because it's too difficult and there are too much.A.loves B.like C.dislikes D.don't like( )3._____they good a 1.____you have a pen?Yes,____ ____.2.____he have a big nose?No,____ ____.3.Does Mary____Small eyes?Yes,she____.4._____they._____maps?Yes,they do.5.Does Steve have long hair?._____,he doesn’t.He._____short hair. 1.How can I help them understand _____they won't listen to me?A.where B.who C.when D.while 为什么选C不选D?2.______more information about the trip,you can go to www.jxtour.com.A.Find B.Finding C.To find D.Found3.---Let's go to the new restaurant 1道IF从句的句型转换1.If you don't water the flowers,they will die________ the flowers,_____they will die.2.If you clean your room every day,it will be goor for your health______your room every day,_____it will be good for your health.好象 They can't help seeing things _____they do.A.the way B.in the way C.the way that D.the way which Did they clean the house esterday?_____They cleaned it at five.A.NO,they didn't.B.Yes,they did顺便帮我翻译一下最后一句话 The boys didn;t leave the classroom until they worked the maths problems.(句意不变）The boys ______the classroom _____they worked the maths problems.