* thì hiện tại hoàn thành
-he has done all his homework
-i have read this book already
-she hasn't been in Da Lat city before
*thì hiện tại tiếp diễn
-they are studying english now
-i am playing badminton with my friends
-she is cooking with her mother
*thì quá khứ đơn
-i went to school yesterday
-we studied english last night
-he didn't come to school last week