present perfect

常見(jiàn)例句

When you ask about something that started in the past but continues to the present time, you use the Present Perfect tense, e.g.
儅你談?wù)搹倪^(guò)去開(kāi)始一直持續(xù)到現(xiàn)在的某件事時(shí)，用現(xiàn)在完成法時(shí)態(tài)。
edu.sina.com.cn
When you ask about something that started in the past but continues to the present time, you use the Present Perfect tense, e.g.: I’ve been there for 5 years / I’ve been there for 5 years.
儅你談?wù)撛谶^(guò)去開(kāi)始但是一直持續(xù)到現(xiàn)在的某事時(shí)，用現(xiàn)在完成時(shí)態(tài)，例如：I’ve been there for 5 years/我在那裡已經(jīng)5年了。
edu.sina.com.cn
If we say when a past event happened (for example, by using time-adverbs), we do not usually use the present perfect.
說(shuō)過(guò)去發(fā)生的事件（例如：用過(guò)去時(shí)間狀語(yǔ)），我們通常不用現(xiàn)在完成時(shí)。
blog.sina.com.cn

This pullback could present the perfect buying opportunity.
FORBES: Buy BBBY While Shares Are Below Recent Highs
But just like the guy who bought the older Volkswagen off my dad, I rarely believe those who present everything as perfect without any dents or challenges.
FORBES: How To Sell Without Being A Salesperson
Pick-n-mix, and you have the perfect millennium present.
ECONOMIST: Shakespeare on tape: Audio-Bard The