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