現在完成時可以表示“已經完成”的動作，也可以表示“未完成”的動作。與其連用的時間狀語
往往是指一段時間的狀語以具體表示某一動作或狀態持續了多久。如：
1. since + 具體時間，表示動作或狀態從何時開始
Since then, he has developed another bad habit.
自那以後他養成了另一個壞習慣。
He hasn"t been home since he graduated.
他畢業後就沒回過家。
2. for + 一段時間，表示動作或狀態持續了多久
We have worked here for ages.
我們在這裡工作很久了。
There has been no rain here for nearly two months.
這裡已經近兩個月沒有下雨了。
3. until now, up till now, so far, up to the moment
到目前為止
I have not seen him so far.
到目前為止我沒見過他。
Up to the present, everything has been OK.
到目前為止一切正常。
4. in/during the past/last five years
在剛剛過去的5年裡
He has been away from school during the last few weeks.
過去的幾個星期裡他沒在學校。
In the past few years they have dealt with quite a few international corporations successfully. 在過去的幾年中他們已經和好幾家跨國公司做成了生意。
5. all the while, all day 一直，一整天
She has been busy all day.
她忙了一整天。
現在完成時可以表示“已經完成”的動作，也可以表示“未完成”的動作。與其連用的時間狀語
往往是指一段時間的狀語以具體表示某一動作或狀態持續了多久。如：
1. since + 具體時間，表示動作或狀態從何時開始
Since then, he has developed another bad habit.
自那以後他養成了另一個壞習慣。
He hasn"t been home since he graduated.
他畢業後就沒回過家。
2. for + 一段時間，表示動作或狀態持續了多久
We have worked here for ages.
我們在這裡工作很久了。
There has been no rain here for nearly two months.
這裡已經近兩個月沒有下雨了。
3. until now, up till now, so far, up to the moment
到目前為止
I have not seen him so far.
到目前為止我沒見過他。
Up to the present, everything has been OK.
到目前為止一切正常。
4. in/during the past/last five years
在剛剛過去的5年裡
He has been away from school during the last few weeks.
過去的幾個星期裡他沒在學校。
In the past few years they have dealt with quite a few international corporations successfully. 在過去的幾年中他們已經和好幾家跨國公司做成了生意。
5. all the while, all day 一直，一整天
She has been busy all day.
她忙了一整天。