第一部分：十大词性
动词：容易混的地方
容易混的地方#
下面几组在上文都讲过推导，这里放在一起对比。
| 容易混的 | 怎么分 | 例句 |
|---|---|---|
| have lunch 与 have eaten 的疑问、否定 | 看 have 后面有没有另一个动词（见上文“助动词”）。have 是实义动词“吃、有”时，借 do 构成疑问和否定；have 是助动词时，自己提前、自己加 not | Do you have an apple for lunch? 你午饭吃苹果吗？ I don't have an apple. 我没有苹果。 Have you eaten the apple yet? 你已经吃了那个苹果吗？ I haven't eaten it yet. 我还没吃。 |
| must 与 have to | must 是说话人自己觉得必须；have to 是外面交过来的事，如规定（见上文“情态动词”） | I must eat less sugar. 我得少吃糖。 Visitors have to pay ten yuan to pick apples on this farm. 来这个农场摘苹果，游客要付十元。 |
| mustn't 与 needn't | mustn't 否定的是后面的动作，“不许做”；needn't 否定的是“需要”，“不必做” | You mustn't pick the apples on this tree. 不许摘这棵树上的苹果。 You needn't wash these apples. 这些苹果你不用洗。 |
| stop、remember、forget 接 to do 与接 doing | to do 指向还没做的动作，doing 指动作本身（见上文“动词后面接 to do 还是 doing”） | He stopped to eat an apple. 他停下来去吃苹果。 He stopped eating apples. 他不再吃苹果了。 Remember to buy apples. 记得去买苹果。 I remember buying apples. 我记得买过苹果。 Don't forget to wash the apple. 别忘了洗苹果。 I'll never forget eating that apple. 我永远忘不了吃那个苹果的情景。 |