什么时候在英语中用主将从现的语法,请具体举例 英语语法中什么时候用主将从现？
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\u5728\u4ee5when\uff0cafter\uff0cas soon as\u7b49\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u4ee5\u53ca\u4ee5if\uff0cunless\u7b49\u5f15\u5bfc\u7684\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u4e2d\uff0c\u5982\u679c\u4e3b\u53e5\u662f\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4ece\u53e5\u5219\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002\u5982\uff1a
I'll tell her the good news when she comes back.
\u5f53\u5979\u56de\u6765\u7684\u65f6\u5019\uff0c\u6211\u5c06\u628a\u8fd9\u4e2a\u597d\u6d88\u606f\u544a\u8bc9\u5979\u3002
If it doesn't rain, he will come here on time.
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1. If\u5f15\u5bfc\u7684\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5,\u9075\u5faa\u4e3b\u5c06\u4ece\u73b0(\u4e3b\u53e5\u662f\u5c06\u6765\u65f6,\u4ece\u53e5\u662f\u4e00\u822c\u73b0\u5728\u65f6),\u65f6\u6001\u4e3a\u4e00\u822c\u73b0\u5728\u65f6\u65f6.
2.\u6709as soon as\u7684\u53e5\u5b50\u4e5f\u9075\u5faa\u4e3b\u8bb2\u4ece\u73b0\u539f\u5219.\u4f46\u662f\u65f6\u6001\u5fc5\u987b\u662f\u4e00\u822c\u73b0\u5728\u65f6
主将从现问题是中考考点之一。它是指在时间状语从句和条件状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。常见的有以下三种情况：
一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时。
如： When I grow up, I’ll be a nurse and look after patients.
我长大后要当一名护士，照顾病人。
二、如果主句是祈使句，那么从句通常要用一般现在时。
如：Don’t laugh at me when I make a mistake.
我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时。
如：You should be quiet when you are in the reading room.
在阅览室时应保持安静。
练习 单项选择（中考题）：
1 If he ___ harder , he will catch up with us soon.（04 北京）
A study B studies C will study D studied
2 I will go swimming with you if I ___ free tomorrow.（04哈尔滨）
A will be B shall be C am D was
3 If you ___ a chance to study in a foreign country ,just take it .（04 苏州）
A getting B had got C will get D get
4 Don’t leave until he ___ back.（）
A have come B comes C will come D came
5 “ Shall we have the volleyball match tomorrow?” “ Oh, it will be put off if it ____.（04 黄冈）
A snows B is snowing C snowed D will snow
6 －Tell him about the news when he ____ ,John. － Yes, I will.（04 宁波）
A comes B will come C would D is coming
7 Tomorrow we will go to the city park____ it is sunny.（05 安徽）
A as soon as B when C if D as
8 Please don’t leave until your teacher ___back.（05河南）
A will come B came C comes D is coming
9 I want to know if there ___a sports meeting next month . If they ___ it , I must get ready for it。（05青岛）
A is,will hold B will be, hold C will be, will hold D will have, hold
10 －Mary, what about going boating if it ___tomorrow. －Good idea.（）
A not rain B will rain C doesn’t rain D won’t rain
参考答案：1-5BCDBA 6-10 ACCBC
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