求英语高手，什么情况下在句子中用isn't，什么时候用don't，求解析！！ 英语什么时候用not,什么时候用isn't
\u4ec0\u4e48\u65f6\u5019\u7528isn't \u6216didn't\u6211\u662f\u82f1\u8bed\u8001\u5e08\uff0c\u6211\u6765\u5e2e\u4f60\u89e3\u7b54\u5427\u3002\u82f1\u8bed\u4e2d\u5982\u53e5\u4e2d\u539f\u6765\u5c31\u6709be \uff0c\u4e5f\u5c31\u662f\uff08am,is,are\uff0cwas,were)\u65f6\uff0c\u6539\u4e3a\u5426\u5b9a\u53e5\u76f4\u63a5\u7528isn't, am not, aren't, wasn't \u548cweren't \u3002\u5982\uff1aHe is a teacher.\u5426\u5b9a\u53e5\uff1aHe isn't a teacher.\u5f53\u53e5\u4e2d\u6ca1\u6709be \u52a8\u8bcd\u65f6\uff0c\u6539\u4e3a\u5426\u5b9a\u53e5\u5c31\u8981\u52a0\u52a9\u52a8\u8bcddo, does,did \u6765\u5e2e\u5fd9\u3002\u5982\uff1aHe comes from England,\u5426\u5b9a\u53e5\uff1aHe doesn't come from England.\u518d\u5982\uff1aHe came from Beijing.\u5426\u5b9a\u53e5\uff1aHe didn't come from Beijing.\u660e\u767d\u4e86\u5417\uff1f\u5e0c\u671b\u6211\u7684\u8010\u5fc3\u56de\u7b54\u80fd\u4ee4\u4f60\u6ee1\u610f\u54e6\uff01
isn't\u662fis not\u7684\u7f29\u5199\uff0c\u53e5\u5b50\u4e2d\u6709is\uff0c\u5426\u5b9a\u4e4b\u540e\u624d\u7528isn't\u3002
没有其他实意动词原形存在的情况下用isn'tThis isn't my book 这不是我的书。句子中除了is没有其他动词原形
句子中已经存在了其他实意动词，使用don't 或 doesn't
I don't like cats. 句中已经有了实意动词 like（喜欢），所以不能使用be动词
有is，需要否定就直接加not，没有is，动词形式是第一、二人称的一般现在时，那么就用do not。比如，i do not like the bag。this is not my bag。
don't后加动词。isn't加动名词
上述三种答案正确！
主系表结构的时候isn't 主渭宾结构的时候don't
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