IF用法 除了主将从现外 IF的主句什么时候用一般现在？？我看许多资料中IF的主句师一般现在啊 if引导的条件状语从句中，主将从现。用一般现在时代替一般将来...
\u82f1\u8bed\u4e0a\u8bb2\u7684\u4e3b\u5c06\u4ece\u73b0\u662f\u4ec0\u4e48\u610f\u601d\u5373\u5728\u65f6\u95f4\u548c\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u4e2d\u8981\u6c42\u7528\u4e00\u822c\u73b0\u5728\u65f6\u4ee3\u66ff\u4e00\u822c\u5c06\u6765\u65f6\u6765\u8868\u793a\u5c06\u6765\u7684\u6982\u5ff5
\u9996\u5148\u6211\u4eec\u6765\u7ffb\u8bd1\u4e00\u4e2a\u53e5\u5b50\uff1a\u5982\u679c\u660e\u5929\u4e0d\u4e0b\u96e8\u7684\u8bdd\uff0c\u6211\u4eec\u5c06\u53c2\u89c2\u516c\u56ed\u3002
\u8fd9\u662f\u4e00\u4e2a\u542b\u6709\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u7684\u590d\u5408\u53e5\uff0c\u4e3b\u53e5\u52a8\u8bcdvisit\u548c\u4ece\u53e5\u52a8\u8bcdrain\u6839\u636e\u65f6\u95f4\u72b6\u8bed\u660e\u5929\u7684\u63d0\u793a\uff0c\u672c\u6765\u90fd\u5e94\u8be5\u7528\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4f46\u662f\u6839\u636e\u4e0a\u9762\u63d0\u5230\u7684\u90a3\u6761\u89c4\u5219\uff0c\u4ece\u53e5\u4e2d\u7684\u8c13\u8bed\u52a8\u8bcd\u4e0d\u80fd\u7528will not rain\uff0c\u800c\u5e94\u8be5\u7528\u4e00\u822c\u73b0\u5728\u65f6doesn\u2019t rain\u6765\u8868\u793a\u5c06\u6765\uff0c\u6240\u4ee5\u6700\u540e\u6211\u4eec\u628a\u8fd9\u53e5\u8bdd\u7ffb\u8bd1\u6210\uff1aWe will visit the park if it doesn\u2019t rain tomorrow.
\u6211\u4eec\u518d\u6765\u7ffb\u8bd1\u4e00\u4e2a\u53e5\u5b50\uff1a\u957f\u5927\u540e\u6211\u60f3\u6210\u4e3a\u4e00\u540d\u6559\u5e08\u3002
\u8fd9\u662f\u4e00\u4e2a\u542b\u6709\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u7684\u590d\u5408\u53e5\uff0c\u4e3b\u53e5\u52a8\u8bcdbe\u548c\u4ece\u53e5\u52a8\u8bcdgrow up\u672c\u6765\u90fd\u5e94\u8be5\u7528\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4f46\u662f\u6839\u636e\u4e0a\u9762\u63d0\u5230\u7684\u90a3\u6761\u89c4\u5219\uff0c\u4ece\u53e5\u4e2d\u7684\u8c13\u8bed\u52a8\u8bcd\u4e0d\u80fd\u7528will grow up\uff0c\u800c\u5e94\u8be5\u7528\u4e00\u822c\u73b0\u5728\u65f6grow up\u6765\u8868\u793a\u5c06\u6765\u3002\u6240\u4ee5\u8fd9\u53e5\u8bdd\u6211\u4eec\u8981\u8fd9\u6837\u7ffb\u8bd1\uff1a
I will be a teacher when I grow up.
\u6709\u4e86\u4e0a\u9762\u7684\u4e24\u4e2a\u4f8b\u5b50\uff0c\u6709\u7684\u540c\u5b66\u53ef\u80fd\u4f1a\u8fd9\u6837\u603b\u7ed3\uff1a\u5728if\u548cwhen\u540e\u7684\u4ece\u53e5\u5e94\u8be5\u7528\u4e00\u822c\u73b0\u5728\u65f6\u8868\u793a\u5c06\u6765\u3002\u8fd9\u6837\u770b\u95ee\u9898\u5176\u5b9e\u4e0d\u5168\u9762\uff0c\u56e0\u4e3aif\u548cwhen\u53c8\u540c\u65f6\u53ef\u4ee5\u662f\u8fde\u63a5\u4e3b\u53e5\u548c\u5bbe\u8bed\u4ece\u53e5\u7684\u4ece\u5c5e\u8fde\u8bcd\uff0c\u8bf7\u770b\u4e0b\u9762\u4e24\u4e2a\u4f8b\u5b50\uff1a
I don\u2019t know when he will come tomorrow. \u6211\u4e0d\u77e5\u9053\u4ed6\u660e\u5929\u4ec0\u4e48\u65f6\u5019\u6765\u3002
I don\u2019t know if he will come tomorrow. \u6211\u4e0d\u77e5\u9053\u4ed6\u660e\u5929\u662f\u5426\u4f1a\u6765\u3002
\u4ee5\u4e0a\u4e24\u4e2a\u4f8b\u5b50\u4e2dwhen\u540e\u5f15\u5bfc\u7684\u4e0d\u662f\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\uff0c\u800c\u662f\u5bbe\u8bed\u4ece\u53e5\uff0c\u56e0\u4e3acome\u662f\u8bf4\u660e\u5929\u53d1\u751f\u7684\u52a8\u4f5c\uff0c\u5728\u4e3b\u53e5\u7528\u4e00\u822c\u73b0\u5728\u65f6\u7684\u60c5\u51b5\u4e0b\uff0c\u4ece\u53e5\u4f9d\u7136\u8981\u7528will come\u6765\u8868\u793a\u5c06\u6765\u7684\u610f\u601d\uff1bif\u540e\u8ddf\u7684\u4e5f\u4e0d\u662f\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff0c\u800c\u662f\u5bbe\u8bed\u4ece\u53e5\uff0c\u6240\u4ee5\u4f9d\u7136\u8981\u7528\u4e00\u822c\u5c06\u6765\u65f6\u8868\u793a\u5c06\u6765\u3002
\u8bf4\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u5c31\u77e5\u9053\u5b9e\u9645\u4e2d\u8003\u5bf9\u8fd9\u4e00\u89c4\u5219\u7684\u8003\u5bdf\u5c31\u662f\u8981\u6c42\u6211\u4eec\u80fd\u591f\u5224\u65adif\u548cwhen\u540e\u9762\u7684\u53e5\u5b50\u5230\u5e95\u662f\u5bbe\u8bed\u4ece\u53e5\u8fd8\u662f\u72b6\u8bed\u4ece\u53e5\u3002\u90a3\u4e48\u5982\u4f55\u8fdb\u884c\u6b63\u786e\u7684\u5224\u65ad\u5462\uff0c\u6211\u89c9\u5f97\u53ef\u4ee5\u4ece\u4ee5\u4e0b\u4e24\u4e2a\u65b9\u9762\u6765\u8003\u8651\uff1a
\u4e00\u3001\u56e0\u4e3a\u72b6\u8bed\u4ece\u53e5\u7684\u4f4d\u7f6e\u53ef\u4ee5\u53d8\u5316\uff0c\u5b83\u65e2\u53ef\u4ee5\u653e\u5728\u4e3b\u53e5\u4e4b\u524d\uff0c\u4e5f\u53ef\u4ee5\u653e\u5728\u4e3b\u53e5\u4e4b\u540e\uff1b\u800c\u5bbe\u8bed\u4ece\u53e5\u7684\u4f4d\u7f6e\u53ea\u80fd\u8ddf\u5728\u4e3b\u53e5\u7684\u8c13\u8bed\u52a8\u8bcd\u4e4b\u540e\uff08\u6709\u65f6\u5019\u4e3b\u53e5\u7684\u8c13\u8bed\u90e8\u5206\u53ef\u4ee5\u662f\u52a8\u8bcd\u52a0\u4ecb\u8bcd\u6784\u6210\uff0c\u56e0\u4e3a\u6211\u4eec\u77e5\u9053\u4e0d\u53ca\u7269\u52a8\u8bcd\u52a0\u4ecb\u8bcd\u540e\uff0c\u5c31\u76f8\u5f53\u4e8e\u4e00\u4e2a\u53ca\u7269\u52a8\u8bcd\uff0c\u53ef\u4ee5\u5e26\u81ea\u5df1\u7684\u5bbe\u8bed\uff09\u3002\u6240\u4ee5\uff0c\u5982\u679c\u6211\u4eec\u80fd\u5bf9if\u6216when\u5f15\u5bfc\u7684\u4ece\u53e5\u7684\u4f4d\u7f6e\u8fdb\u884c\u53d8\u5316\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u5224\u65ad\u5b83\u4eec\u4e4b\u540e\u7684\u53e5\u5b50\u662f\u72b6\u8bed\u4ece\u53e5\uff0c\u4ece\u53e5\u4e2d\u5c31\u53ea\u80fd\u7528\u4e00\u822c\u73b0\u5728\u65f6\u6765\u8868\u793a\u5c06\u6765\u7684\u6982\u5ff5\uff1b\u5982\u679cif\u6216when\u5f15\u5bfc\u7684\u4ece\u53e5\u4e0d\u80fd\u8fdb\u884c\u4f4d\u7f6e\u7684\u53d8\u5316\uff0c\u5b83\u4eec\u5f15\u5bfc\u7684\u5c31\u662f\u5bbe\u8bed\u4ece\u53e5\u3002
\u4f8b\u5982\uff1a We will visit the park if it doesn\u2019t rain tomorrow.
= If it doesn\u2019t rain tomorrow, we will visit the park.\uff08\u6240\u4ee5\u8fd9\u4e2a\u590d\u5408\u53e5\u4e2dif\u5f15\u5bfc\u7684\u4ece\u53e5\u4e3a\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u3002\uff09
I will be a teacher when I grow up.
= When I grow up, I will be a teacher.\uff08\u6240\u4ee5\u8fd9\u4e2a\u590d\u5408\u53e5\u4e2dwhen\u5f15\u5bfc\u7684\u4ece\u53e5\u4e3a\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u3002\uff09
\u6211\u4eec\u4e0d\u80fd\u628a \u201cI don\u2019t know when he will come tomorrow.\u201d\u8bf4\u6210\u201cWhen he will come tomorrow, I don\u2019t know.\u201d
\u6211\u4eec\u4e5f\u4e0d\u80fd\u628a \u201cI don\u2019t know if he will come tomorrow.\u201d\u8bf4\u6210\u201cIf he will come tomorrow, I don\u2019t know.\u201d
\u6240\u4ee5\u8fd9\u4e24\u4e2a\u590d\u5408\u53e5\u7684\u4ece\u53e5\u90fd\u662f\u5bbe\u8bed\u4ece\u53e5\u3002
\u4e8c\u3001\u6839\u636e\u610f\u601d\u6765\u5224\u65ad\uff1aif\u5f15\u5bfc\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u5e94\u8be5\u662f\u201c\u5982\u679c/\u5047\u5982\u201d\u7684\u610f\u601d\uff0c\u800cif\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\u7684\u65f6\u5019\uff0c\u5f80\u5f80\u5e94\u8be5\u7ffb\u8bd1\u6210\u201c\u662f\u5426\u201d\uff1bwhen\u5728\u5f15\u5bfc\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\u5e94\u8be5\u662f\u201c\u5f53\u2026\u2026\u65f6\u5019\u201d\u7684\u610f\u601d\uff0c\u800cwhen\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5\uff0c\u5f80\u5f80\u5e94\u8be5\u7ffb\u8bd1\u6210\u201c\u4ec0\u4e48\u65f6\u5019\u201d\u3002
\u901a\u8fc7\u4ee5\u4e0a\u5206\u6790\uff0c\u540c\u5b66\u4eec\u5b8c\u5168\u7406\u89e3\u4e86\u8fd9\u6761\u89c4\u5219\u5417\uff1f\u8fd9\u6761\u89c4\u5219\u8fd8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u6df1\u5165\uff1a\u5728\u65f6\u95f4\u548c\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\u4e2d\u8981\u6c42\u7528\u4e00\u822c\u8fc7\u53bb\u65f6\u6765\u8868\u793a\u8fc7\u53bb\u5c06\u6765\u7684\u6982\u5ff5\u3002\u5728\u8f6c\u8ff0\u522b\u4eba\u7684\u6253\u7b97\u65f6\uff0c\u6211\u4eec\u5f80\u5f80\u8981\u7528\u8fd9\u6761\u89c4\u5219\u3002\u4f8b\u5982\uff1a1. He said he would go to visit the park if it did not rain the next day. \u4ed6\u8bf4\u5982\u679c\u7b2c\u4e8c\u5929\u4e0d\u4e0b\u96e8\u7684\u8bdd\u4ed6\u5c31\u53bb\u516c\u56ed\u30022. He said he would be a teacher when he grew up. \u4ed6\u8bf4\u4ed6\u957f\u5927\u540e\u5c06\u5f53\u4e00\u540d\u6559\u5e08\u3002
if\u7528\u4e00\u822c\u73b0\u5728\u65f6\u4ee3\u66ff\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4f46\u662f\u4e3b\u53e5\u7528\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u56fa\u5b9a\u3002
选would meant。这种情况，有个十三字口诀：“主将从现，主过将从过，主现从现”。即主句是一般将来时，从句用一般现在时；主句用过去将来时，从句用一般过去时；当主句中有can/can’t的话，则从句用一般现在时。这里从句是一般过去时，所以主句用过去将来时(would mean)。当然以上说的是指真实条件句。
非真实条件句表示的是假设或实际可能性不大的情况，故采用虚拟语气：
1、表示与现在事实相反的情况：
从句：主语+过去时
主句：主语+should/would/could/might+do
2、表示与过去事实相反的情况
从句：主语+had done
主句：主语+should/would/could/might+have done
3、表示对将来情况的主观推测
从句：①if+主语+were to do 主句：①主语+should/would/could/might+do
②if+主语+did/were ②主语+should/would/could/might+do
③if+主语+should+do ③ 主语+should/would/could/might+do
这个句子中选would mean，从句表示对过去的假设，主句用故去将来时。
扩展阅读：if三个判断条件三个结果 ... if so用法详解 ... vlookup if多条件查询 ... 除了和之外可以一起用吗 ... 三个条件的if函数实例 ... 除了英语几种说法 ... 英语中三个除了的用法 ... if的三种句型 ... if 三个条件 显示3个结果 ...
