英文筆記-for / since / age(五)

for(配合現在完成式)
-時間(區間)
-two days, two weeks, two months...
-for + time(區間)
-Peter has been in Taiwan for four weeks.
(彼得四週前已經來到台灣)

since(配合現在完成式)
-時間(自從)
-10:00, Sunday, 2000...
-since + time(自從)
-Peter has been in Taiwan since he was four years old.
(彼得自從他四歲時已經來到台灣)

ago(過去簡單式)
-從此時往前推
-time(往前推多久) + ago
-Peter arrived Taiwan four weeks ago.