1.Chuyển đổi từ hiện tại hoành thành sang quá khứ đơn (và ngược lại):
a.Nam hasn't seen Mary since 2005
->The last time Nam...saw Mary was in 2005........................................
b,It's nearly twenty years since my father saw my uncle.
->My father hasn't ......  seen my uncle for nearly twenty years.........................................
c,We last saw our granfather two years ago
->We haven't................seen our grandfather for two years......................................
d,We hasn't been back to his home for ten years.
->It's ten years..........since we last went back to his home........................................
2.Thể bị động:
a,thì hiện tại đơn:
+My mother makes some cakes for my family
->.....Some cakes are made for my family by my mother..........................................................
+These young people always wear ieans 
->......Jeans are worn by these young people........................................................
+We ask visitors not to smoke in this area 
->.....The visitors are asked not to smoke in this area.........................................................
+People spend a lot of money on advertising everyday
->....A lot of money .....is spent on advertising everyday.....................................................
+She usually decorates the room at weekends.
->....The room is decorated  at weekends. by her.........................................................
3.thì quá khứ đơn:
+she gave us more information
->....We were given more information by her...........................................................
+her teacher taught her how to apply this theory.
->....She was taught how to apply this theory by her teacher............................................................