if only和only if区别是什么？ only if,if only分别是什么意思？有什么区别

if only&only if\u6709\u4ec0\u4e48\u533a\u522b\uff1f

only if\uff1a\u53ea\u6709\u3001\u9664\u975e,\u610f\u601d\u76f8\u5f53\u4e8eunless,\u4f46\u7528\u4e8e\u80af\u5b9a\u53e5,\u5f15\u5bfc\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff1aI will go only if you go with me.\u9664\u975e\u4f60\u8ddf\u6211\u4e00\u8d77\u8d70,\u5426\u5219\u6211\u5c31\u4e0d\u8d70\uff08\u53ea\u6709\u4f60\u8ddf\u6211\u4e00\u8d77\u8d70\u6211\u624d\u8d70\uff09.
\u6bd4\u8f83\uff1aunless,\u7528\u4e8e\u5426\u5b9a\u53e5\uff1aI won't go unless you go with me.
If only\uff1a\u53ea\u8981,\u5f15\u5bfc\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff1aIf only it clears up,we'll go.\u53ea\u8981\u5929\u4e00\u653e\u6674,\u6211\u4eec\u5c31\u8d70.\u8981\u662f\u2026\u2026\u5c31\u597d\u4e86,\u5f15\u5bfc\u72ec\u7acb\u53e5\uff1aIf only you had won the game!\u4f60\u8981\u662f\u8d62\u4e86\u8be5\u591a\u597d\u554a.
Only if \u7528\u4e8e\u53e5\u9996\uff0c\u7528\u5012\u88c5\u8bed\u5e8f\uff0cOnly if a teacher has given permission is a student allowed to enter this room. \u53ea\u6709\u5f97\u5230\u8001\u5e08\u7684\u5141\u8bb8\uff0c\u5b66\u751f\u624d\u80fd\u8fdb\u5165\u8fd9\u95f4\u6559\u5ba4\u3002
if only\uff1a \u4f46\u613f \u8868\u793a\u5bf9\u73b0\u5728\u548c\u5c06\u6765\u7684\u613f\u671b\uff0c\u6216\u4e0e\u8fc7\u53bb\u4e8b\u5b9e\u76f8\u53cd\u7684\u613f\u671b\u3002 If only it would stop raining \u771f\u5e0c\u671b\u96e8\u80fd\u505c\u3002
\u4e00\u3001if only\u7684\u7528\u6cd5\u3002if only\u540e\u9762\u8ddf\u7684\u662f\u865a\u62df\u8bed\u6c14\u7684\u53e5\u5b50\uff0c\u8868\u793a\u4e0e\u4e8b\u5b9e\u76f8\u53cd\u7684\u5047\u8bbe\u3002If only I had more money, I could buy some new clothes. \u8981\u662f\u6211\u6709\u66f4\u591a\u7684\u94b1\uff0c\u6211\u53ef\u4ee5\u4e70\u4e9b\u65b0\u8863\u670d\u3002If only he had arrived in time. \u8981\u662f\u4ed6\u80fd\u53ca\u65f6\u8d76\u5230\u5c31\u597d\u4e86\u3002If only I had known it, I wouldn't have troubled him. \u8981\u662f\u6211\u77e5\u9053\uff0c\u6211\u5c31\u4e0d\u4f1a\u9ebb\u70e6\u4ed6\u4e86\u3002If only that photograph weren't missing. \u8981\u662f\u90a3\u5f20\u7167\u7247\u6ca1\u4e22\u5931\u8be5\u591a\u597d\u3002\u4e8c\u3001only if\u7684\u7528\u6cd5\u3002only if\u540e\u9762\u8ddf\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff0c\u7528\u9648\u8ff0\u8bed\u6c14\uff0c\u540e\u9762\u7528\u90e8\u5206\u5012\u88c5\u53e5\uff0cbe\u52a8\u8bcd\u3001\u52a9\u52a8\u8bcd\u548c\u60c5\u6001\u52a8\u8bcd\u653e\u5728\u4e3b\u8bed\u4e4b\u524d\uff0c\u8868\u793a\u4e00\u79cd\u5145\u5206\u975e\u5fc5\u8981\u6761\u4ef6\uff0c\u610f\u601d\u662f\u53ea\u8981\u3002Only if you passed the entrance exam and became a college student, will I accept you as a friend.\u53ea\u8981\u4f60\u901a\u8fc7\u9ad8\u8003\uff0c\u6210\u4e3a\u5927\u5b66\u751f\uff0c\u6211\u5c31\u4f1a\u8ba4\u4f60\u4e3a\u670b\u53cb\u3002Only if we persist in carrying out the open door policy, will we achieve greater success in every field.\u53ea\u8981\u6211\u4eec\u575a\u6301\u6539\u9769\u5f00\u653e\uff0c\u6211\u4eec\u5c31\u80fd\u5728\u5404\u4e2a\u65b9\u9762\u53d6\u5f97\u66f4\u5927\u7684\u6210\u5c31\u3002

only if：只有、除非,意思相当于unless,但用于肯定句,引导条件状语从句：I will go only if you go with me.除非你跟我一起走,否则我就不走（只有你跟我一起走我才走）.

比较：unless,用于否定句：I won't go unless you go with me.

If only：只要,引导条件状语从句：If only it clears up,we'll go.只要天一放晴,我们就走.
要是……就好了,引导独立句：If only you had won the game!你要是赢了该多好啊.

Only if 用于句首，用倒装语序，Only if a teacher has given permission is a student allowed to enter this room. 只有得到老师的允许，学生才能进入这间教室。

if only： 但愿 表示对现在和将来的愿望，或与过去事实相反的愿望。 If only it would stop raining 真希望雨能停。

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