if引导什么时态 英语if翻译为"是否"和"如果"时，if前后句子的时态分别有...
if\u5f15\u5bfc\u7684\u865a\u62df\u8bed\u6c14\u5e94\u8be5\u7528\u4ec0\u4e48\u65f6\u6001if\u865a\u62df\u8bed\u6c14\u7684\u4e09\u79cd\u65f6\u6001
\u6839\u636e\u53e5\u5b50\u7ed3\u6784\u6765\u5224\u65ad\uff1a
1\u3001if \u4f5c\u4e3a\u201c \u662f\u5426\u201d \u5f15\u5bfc\u7684\u662f\u5bbe\u8bed\u4ece\u53e5\uff0c\u8868\u8bed\u4ece\u53e5\uff0c\u4e00\u822c\u653e\u5728\u52a8\u8bcd\u540e\uff1b\u4e0d\u80fd\u653e\u5728\u53e5\u5b50\u5f00\u5934\u3002\u4ece\u53e5\u6839\u636e\u53e5\u5b50\u610f\u601d\u53ef\u7528\u4e0d\u540c\u7684\u65f6\u6001\u3002
2\u3001if \u4f5c\u4e3a\u201c\u5982\u679c\u201d \u5f15\u5bfc\u7684\u662f\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff0c\u4ece\u53e5\u653e\u5728\u53e5\u5b50\u5f00\u5934\u65f6\uff0c\u540e\u9762\u7528\u9017\u53f7\u2018\uff0c\u2019 \u9694\u5f00\uff1b\u4ece\u53e5\u653e\u5728\u4e3b\u53e5\u4e4b\u540e\u65f6\u4e0d\u80fd\u7528\u9017\u53f7\u5206\u5f00\uff1b\u9075\u5faa\u201c \u4e3b\u5c06\u4ece\u73b0\u201d\u539f\u5219\uff0c\u5373\uff1a\u4e3b\u53e5\u7528\u4e00\u822c\u5c06\u6765\u65f6\uff0c\u4ece\u53e5\u7528\u4e00\u822c\u73b0\u5728\u65f6\u3002
if \u4f5c\u4e3a\u2018 \u5982\u679c\u201c\u65f6\uff0c\u5e38\u89c1\u7684\u53e5\u578b\u6709\u4e0b\u9762\u60c5\u51b5\uff1a
1\uff09\u4e3b\u53e5\u662f\u4e00\u822c\u5c06\u6765\u65f6+if +\u4e00\u822c\u73b0\u5728\u65f6\uff1b
2\uff09\u4e3b\u53e5\u662f\u7948\u4f7f\u53e5+if +\u4e00\u822c\u73b0\u5728\u65f6\uff1b
3\uff09\u4e3b\u53e5\u6709\u60c5\u6001\u52a8\u8bcd+if +\u4e00\u822c\u73b0\u5728\u65f6
\u59821\u3001I don't know if he will come tomorrow.\u6211\u4e0d\u77e5\u9053\u4ed6\u660e\u5929\u662f\u5426\u4f1a\u6765\u3002
2\u3001 I am not sure if he has finished his homework .\u6211\u4e0d\u786e\u5b9a\u4ed6\u662f\u5426\u5df2\u5b8c\u6210\u4f5c\u4e1a\u3002
3 \u3001I want to know if he is from America.\u6211\u60f3\u77e5\u9053\u4ed6\u662f\u5426\u6765\u81ea\u7f8e\u56fd\u3002
\u6269\u5c55\u8d44\u6599\uff1a
1. if\u548cwhether\u5728\u5bbe\u8bed\u4ece\u53e5\u4e2d\uff0c\u90fd\u8868\u201c\u662f\u5426\u201d\uff0c\u53ef\u6362\u7528\uff0cif\u66f4\u53e3\u8bed\u5316\uff0cwhether\u6b63\u5f0f\u4e9b\u3002
\u5f53\u6709or not\u65f6\uff0c \u4e00\u822c\u7528whether\uff0c\u800c\u4e0d\u7528if\u3002
He wants to know if/whether you can help him.
She wonders whether you'll go or not.
2. if\u53ef\u5f15\u8d77\u6761\u4ef6\u72b6\u8bed\u4ece\u53e5\uff0cwhether\u4e0d\u7528\u4e8e\u72b6\u8bed\u4ece\u53e5\u3002
If you work hard, you'll succeed.
If I were you , I would do it in another way.
\u53c2\u8003\u8d44\u6599\u6765\u6e90:IF \uff08\u82f1\u6587\u5355\u8bcd\uff09 -\u767e\u5ea6\u767e\u79d1
虚拟语气即事件发生几率很低，几乎为0。因此为了让读者明白说话人究竟是在说想象的事件还是真实的事件，这两种情况要在文字中体现出来。真实事件就是你所学过的所有时态，而想象事件就用虚拟语气，要跟正常的时态不一样。至于如何分辨有两种情况1.你在做题，那么题目和选项都很明显是虚拟还是真实。2.你想自己造句，那么你心里清楚你要表达真实还是虚拟，按照原则造句就行。具体到if的话很简单，if从句只有两种情况：主将从现（真实），虚拟语气（虚拟）
下面if从句的虚拟语气原理：
1. 如果句子在想象现在发生而实际未发生的事件，由现在时倒退成过去时：
（从句）if+过去时，（主句）4个情态动词+动词原形
2. 如果句子在想象将来发生而实际不会发生的事件，由将来时倒退成过去时，所以与1是一样的，但是此处从句有三种：
（从句）if+过去时/if+were to do/if+should do，（主句）4个情态动词+动词原形
3. 如果句子在想象过去发生而实际没有发生的事件，有过去时倒退成过去完成时：
（从句）if+过去完成时，（主句）4个情态动词+have done
把以上三个原则的时间弄明白是关键。你问你的具体的题，题中出现了yeasterday，因此判定是在想象过去发生而实际并未发生的事件，所以应该倒退成过去完成时，即 If you had been at home yesterday, i would have come to see him。
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