《I've had this bike for three years》PPT课件4
《I've had this bike for three years》PPT课件4第4页

for 和 since 在现在完成时中的应用

for与since都能与现在完成时连用,但区别较大: (1)for后须接“时间段” He has studied English for five years. (2)since后须接“时间点” He has studied English since 1999.