if unless until 引导什么从句 什么是if引导的条件状语从句，主将从现
if \u4e0eunless\u5f15\u5bfc\u4ec0\u4e48\u4ece\u53e5\u8fd9\u4e24\u4e2a\u8bcd\u653e\u5728\u53e5\u9996\u6216\u53e5\u5c3e\u5728\u7528\u6cd5\u4e0a\u662f\u4e00\u6837\u7684,\u53ea\u662f\u65cf\u5728\u53e5\u9996,\u5c31\u662f\u4e24\u4e2a\u53e5\u5b50,\u653e\u5728\u53e5\u4e2d,\u5c31\u662f\u4e00\u4e2a\u53e5\u5b50,\u4e5f\u5c31\u662f\u8bf4\u662f\u7528if\u6216unless\u5c06\u4e24\u4e2a\u53e5\u5b50\u8fde\u63a5\u6210\u4e00\u4e2a\u53e5\u5b50.
\u4f8b:If it were not for your help,I would not have succeeded.\u8981\u4e0d\u662f\u4f60\u7684\u5e2e\u5fd9,\u6211\u662f\u4e0d\u4f1a\u6210\u529f\u7684.
= I would not have succeeded if it were not for your help.
unless = if.not\u7528\u6765\u5f15\u5bfc\u5426\u5b9a\u7684\u6761\u4ef6\u53e5,\u4e5f\u5c31\u662f\u8bf4\u7528\u6765\u4ee3\u66ff\u5426\u5b9a\u7684if\u4ece\u53e5.
\u4f8b:If Max doesn't come on time,we will leave without him.\u5982\u679cMax\u6ca1\u51c6\u65f6\u6765,\u6211\u4eec\u5c31\u4e0d\u7b49\u4ed6\u5148\u8d70.
=Unless Max comes on time,we will leave without him.
not+unless=only...if \u8868\u793a"\u5982\u679c...\u7684\u8bdd"
\u4f8b:Venus won't come unless Nancy does.Venus\u4e0d\u4f1a\u6765,\u9664\u975eNancy\u6709\u6765.
=Venus will not oonly come if Nancy does.
\u6ce8\u610f,\u8fd9\u91cc\u7684only\u53ea\u662f\u7528\u6765\u5f3a\u8c03if ,\u4e0e if only(\u8981\u662f...\u5c31\u597d\u4e86) \u610f\u601d\u4e0d\u540c\u5594~
\u4e3b\u5c06\u4ece\u73b0\u662f\u6307\u5728\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5 \u548c\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u548c\u8ba9\u6b65\u72b6\u8bed\u4ece\u53e5\u4e2d\uff0c\u5982\u679c\u4e3b\u53e5\u662f\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4ece\u53e5\u7528\u4e00\u822c\u73b0\u5728\u65f6\u66ff\u4ee3\u4e00\u822c\u5c06\u6765\u65f6\u3002
\u5e38\u89c1\u7684\u6709\u4ee5\u4e0b\u60c5\u51b5\uff1a \u3000\u3000
1\u3001\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u7684\u4e3b\u53e5\u662f\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u90a3\u4e48\u4ece\u53e5\u5e38\u5e38\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002 \u3000
2\u3001\u5982\u679c\u4e3b\u53e5\u662f\u7948\u4f7f\u53e5\uff0c\u90a3\u4e48\u4ece\u53e5\u901a\u5e38\u8981\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002
3\u3001\u5982\u679c\u4e3b\u53e5\u662f\u542b\u6709\u60c5\u6001\u52a8\u8bcd\u7684\u4e00\u822c\u73b0\u5728\u65f6\uff0c\u6839\u636e\u9700\u8981\u4ece\u53e5\u591a\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002
If\u5f15\u5bfc\u7684\u975e\u771f\u5b9e\u6761\u4ef6\u53e5\u4e2dif\u7684\u7701\u7565
If\u5f15\u5bfc\u7684\u975e\u771f\u5b9e\u6761\u4ef6\u53e5\u4e2d\uff0c\u5982\u679c\u4ece\u53e5\u4e2d\u6709were\u3001had\u3001should\u8fd9\u4e09\u4e2a\u5355\u8bcd\u7684\u8bdd\uff0c\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u683c\u5f0f\u5c06If\u7701\u7565\u3002
\u5f15\u5bfc\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u7684\u8fde\u8bcd\u6709\uff1aif\uff08\u5982\u679c\uff09\uff0cunless\uff08\u9664\u975e\uff1b\u5982\u679c\u4e0d\uff09\uff0cas long as\uff08\u9664\u975e\uff1b\u53ea\u8981\uff09\uff0csupposing\uff08\u5047\u8bbe\uff09\uff0con condition that\uff08\u6761\u4ef6\u662f\uff09\uff0cin case\uff08\u5982\u679c\uff09\u3002
\u4ee5\u4e0a\u5185\u5bb9\u53c2\u8003\uff1a\u767e\u5ea6\u767e\u79d1-\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5
扩展资料：
在句子中作条件状语的从句称为条件状语从句。
条件状语从句可置于句首，也可以置于句尾，有时还可置于主语和谓语之间。
引导条件状语从句的常用引导词为：if、unless、as/so long as、once、in case、on condition that、supposing (that)、providing (that)、provided (that)、given (that)等。
在条件状语从句中，一般要用一般现在时表示一般将来时，一般过去时表示过去将来时，现在完成时表示将来完成时。
（一）if引导的条件状语从句
If是引导条件状语从句最常用的连词，表示在某种条件下某事很可能发生。
例句：Ifyou heat ice,it melts.
如果你给冰加热，它会融化。
例句：Ifyou do not learn to think when you are young,you may never learn.
如果年轻时不学会思考，你也许永远不会思考。
注意！If从句还表示不可实现的条件或根本不可能存在的条件，也就是一种虚拟的条件或假设，从句多用一般过去时或过去完成时。条件状语从句分为真实条件状语从句和非真实条件状语从句。
（二）unless引导的条件状语从句
Unless意为“除非，若不，除非在......的时候”。
例句：Courage is doing what you're afraid to do.There can be no courage unless you are scared.
勇气就是去干你所畏惧的事情。只有当你胆怯时才有勇气可言。
例句：Victory won't come to us unless we go to it.
胜利不会走向我们，我们必须自己走向胜利。
例句：Unless it rains,the game will be played.
除非下雨，比赛将照常进行。
注意！Unless的意思相当于if...not...。上面的最后两个例子可变为：
Victory won't come to us if we don't go to it.
If it doesn't rain,the game will be played.
资料来源于网络若侵权联系删除
扩展阅读：the file is possibly ... until unless if的区别 ... sound of silence ... piece of music ... although和though区别 ... 电脑出现the file is ... unless and until ... understanding ... unless if not ...
