1 remember to turn off the light befor going out'' my mother said 
my mother reminded
2the computer didn't cost as much as we expected
the computer is 
3the thetar is near hoa's house
the theater isn't
4 there where more people at the meeting than at the last one
there were fewer
5 I lived on a farm once but I don't any more
I used
6mark is too young to ride his bike to scholl
mark isn't
7it started raining an hour ago
it has
8 I have studied english for three years
I began
9 do you see my pen?I have just the lesson with it
do you see my pen 
10 wemust pay the bill at once
the bill 
11his hair isn't as long as it used to be 
he used to