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上列句子中，不使用“already”一样的可以表示已经完成（already表强调），某个时间点做某事的全部完成而不是部分完成。
| 现在完成时 | 一般过去时 |
|---|---|
| I’ve just had a cup.(刚喝了一杯) | I had one after my lunch.(饭后喝了一杯) |
现在完成时态用来描述过去发生的动作或事件与现在的关联。它通常表示一个过去的行为、经历或状态对现在造成的影响或结果。现在完成时态里的动作是过去发生的，到现在这个时间时，可以全部完成，也可以部分完成。
| 全部完成（可以转为一般过去时） | 部分完成 |
|---|---|
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| 原型 | 三单(现在时) | 过去式(一般过去时) | 过去分词(完成时) | 现在分词(进行时) |
|---|---|---|---|---|
| do (规则) | does | did | done | doing |
| 一般情况 + s | 一般情况 + ed | 一般情况 + ing | ||
| 以辅音字母 + y 结尾,变 y 为 i + es | 以辅音字母 + y 结尾,变 y 为 i + ed | 以ie结尾，变ie为y + ing | ||
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| 陈述句 | 否定句 | 一般疑问句 |
|---|---|---|
| 主语 + has\have + done | have\ has + not | have\ has 提前 |
| I have aired the room. | You have not aired the room. | Have you aired the room? |
| He has watched the movie. | He has not watched the movie. | Has he watched the movie? |
| We have arrived in Beijing. | We have not arrived in Beijing. | Have we arrived in Beijing? |
| I have had breakfast. | You have not had breakfast. | Have you had breakfast? |
| He has had his holiday. | He has not had his holiday. | Has he had his holiday? |
| She has had a haircut. | She has not had a haircut. | Has she had a haircut? |
have/has 这里不会翻译任何的意思出来，在现在完成时里的have/has与一般现在时里的do/does一样是助动词，用于帮助实义动词的过去分词实现现在完成时态的。
所以have/has的用法也和do/does一样。在否定句、疑问里面直接提前或者加not。
| Have you had any | fruit. |
| bananas. | |
| oranges. | |
| peaches. | |
| apples. |
| 复数 | 单数 | ||
|---|---|---|---|
| Have some coffee. | I've already had some. | Have a banana. | I've already had one. |
| Have some beer. | Have an apple. | ||
| Have some milk. | Have a peach. | ||
| Have some cheese. | Have a glass of water. | ||
| Have some juice. | Have a biscuit. | ||
可数名词使用one替换，不可数使用some.