现在完成时的标志词主要包括以下几种：
Already:用于肯定句中，表示某事已经完成。
I have already finished the work.
我已经完成了这项工作。
yet：用于否定句和疑问句中，表示某事尚未完成。
Have you finished your homework yet?
你已经完成了你的作业吗？
Just：用于肯定句中，表示某事刚刚发生。
He has just finished his homework.
他刚刚完成了他的作业。
Ever：用于描述一种持续的状态或频率，常用于疑问句中。
Have you ever been to the Great Wall?
你曾经去过长城吗？
Never：用于描述一种从未发生的状态，常用于否定句中。
I have never given up my dream.
我从未放弃过我的梦想。
Since：用于描述从某个时间点开始的动作或状态，常用于现在完成时的句子中。
I have been living in this city since 2010.
自从2010年以来，我一直住在这个城市。
For：用于描述一个时间段，常用于现在完成时的句子中。
He has been studying English for three years.
他学习英语已经三年了。
【短暂性动词与延续性动词的转换】
1、 put on→wear/be on/have on（穿上）
The actress put on a golden evening gown just now.
这位女演员刚才穿上了一件金色的晚礼服。→
①The actress was wearing a golden evening gown the whole evening.这位女演员整个晚上都穿着一件金色的晚礼服。
②The actress was on a golden evening gown the whole evening.
③The actress had on a golden evening gown the whole evening.
④The actress has worn a golden evening gown for a whole evening.这位女演员已经穿了一整晚的金色晚礼服。
⑤The actress has been on a golden evening gown for a whole evening.
⑥The actress has had on a golden evening gown for a whole evening
2、open（营业）→be open/on
The factory opened in the October of 2020. 该工厂于2020年10月开业。
→The factory has been open/on since the October of 2020.
→The factory has been open/on for five years.
3、 join加入→be a League member/soldier;
be a member of the League;
be in the League/the army
1）I joined the League in 2023.
我在2023年入团。 →
①I have been a League member since 2023.
②I have been a League member for 2 years.
③I have been a member of the League since 2023.
④I have been a member of the League for 2 years.我入团已经两年了。
⑤I have been in the League since 2023.
⑥I have been in the League for 2 years.
2）I joined the army in 2020. →
①I have been a soldier since 2020.
②I have been a soldier for 5 years.
③I have been in the army since 2020.
④I have been in the arm for three years.
4、 leave →be away from（离开）
Mary's elder sister left her hometown for the metropolis ten years ago.玛丽的姐姐十年前离开家乡去了大都市。 →
①Mary's elder sister has been away from her hometown and in the metropolis since ten years ago.玛丽的姐姐从十年前就离开了家乡，住在大都市。
②Mary's elder sister has been away from her hometown and in the metropolis for ten years.玛丽的姐姐已经离开家乡在大都市已有十年了。
5、marry →be married（结婚）
Tom and Alice married three years ago. 汤姆和爱丽丝三年前就结婚了。→
①Tom married Alice three years ago.
②Tom and Alice have been married since three years ago.
④Tom and Alice have been married for three years.
6、go to sp（去某地）→be in sp
The models have gone to Beijing two days ago. 模特们去了北京→
①The models have been in Beijing since two days ago.模特们两天前就在北京了。
②The models have been in Beijing for two days.模特们已经在北京呆了两天了。
7、get to know → know（认识）