五、 現(xiàn)在完成時：
1.概念：過去發(fā)生或已經(jīng)完成的動作對現(xiàn)在造成的影響或結(jié)果,或從過去已經(jīng)開始,持續(xù)到現(xiàn)在的動作或狀態(tài).
2.時間狀語：recently,lately,since…for…,in the past few years,etc.
3.基本結(jié)構(gòu)：have/has + done
4.否定形式：have/has + not +d one.
5.一般疑問句：have或has.
6.例句：I've written an article.
It has been raining these days.
I have answered the quesion
The quesipn has been solved
Computer has been invited for many years
Have you been to the USA?
He has gone to home