Peter and Tom come from England.变成否定句怎么改？
1. 解答: 这句话因为主语Peter相当于第三人称单数的人称代词he，谓语动词用的又是动词的第三人称单数形式comes，那么否定形式必须选用助动词does，而且否定之后谓语动词comes必须恢复为原形形式come。答案: Peter doesn't come to school early.
2. 语法: 一般现在时表示现阶段经常、反复发生的动作或行为。其构成是谓语动词在绝大多数情况下，使用动词原形形式。但在主语为第三人称单数的人称代词he，she，it或与之相当的名词时，谓语动词使用动词的单三形式，即动词词尾加–s或–es。动词由原形变为单三形式，规则基本上与可数名词由单数变为复数相同，不同的需要特别识记。一般现在时的助动词是do（does）。注意: 当一般现在时的句子借助助动词而变形为疑问句、否定句或强调句时，谓语动词必须恢复为动词原形。
3. 例句:
① Tom likes playing football. How about Mary? What does she like doing?
汤姆喜欢踢足球。玛丽呢？她喜欢做什么？
② We often go swimming in the lake. But Jimmy often goes boating with his parents.
我们常常在湖里游泳。但吉姆常常和父母亲去划船。
When do you have home?
I walk to school.
How does Kitty come to school?
Ben doesn't live near the park.
Do Peter and Tom walk to school?
I come to school by subway.
仅供参考，望能帮助到你，呵呵！
观察一下原句，一般现在时态，句子主语是复数 Peter and Tom，谓语动词是实义动词 come，这样其否定句只需要在谓语动词前面加上 don't 即可，也没有其他任何需要变化的形式。
所以，它的否定句就是：Peter and Tom don't come from England.
行为动词做谓语，一般现在时态主语是复数，变否定句借助助动词don't
Peter and Tom don't come from England.
上述句子改为否定句为
Peter and Tom don't come from England.
这句话的翻译为
彼得和汤姆不是来自英国。
考点为，含有实义动词的陈述句变为否定句，
一加否定助动词don't或didn't
二将谓语动词还原成谓语动词原形
否定句：
Peter and Tom don’t come from England.
一般现时否定句：
含is am are 在其后加not
有实义动词的，don’t 或doesn’t 十动词原形
根据come可知，句子是一般现在时态。
再看主语是“Peter and Tom”，是复数形式。
所以否定句变化是“don't come”.
完整的句子是：
Peter and Tom don't come from England.
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