I - FEED MY DOG. IT MUST BE HUNGRY. (-)
I HAVEN'T FED MY DOG.
HIS PARENTS - BUY HIM A BIKE (-)
HIS PARENTS HAVEN'T BOUGHT HIM A BIKE.
MY FRIEND - DO THE HOMEWORK (-)
MY FRIEND HASN'T DONE THE HOMEWORK.
SHE - BREAK HER LEG ONCE (+)
SHE HAS BROKEN HER LEG ONCE.
HE - GO TO THE BANK.
HE HAS GONE TO THE BANK.
I - BE/GO TO LONDON (-)
I HAVEN'T BEEN TO LONDON
HE - UNDERSTAND THE LESSON. (-)
HE HASN'T UNDERSTOOD THE LESSON.
- IS THE TEACHER IN THE CLASSROOM? - NO, SHE - BE/GO TO THE LIBRARY.
SHE HAS GONE TO THE LIBRARY.
MY SISTER - LOSE HER WATCH (+)
MY SISTER HAS LOST HER WATCH.
I - BE TO THE USA (-)
I HAVEN'T BEEN TO TH USA.
HE - DRIVE TO THE BEACH 3 TIMES (+)
HE HAS DRIVEN TO THE BEACH 3 TIMES.
HE - CLEAN THE HOUSE. IT'S A MESS. (-)
HE HASN'T CLEANED THE HOUSE . IT'S A MESS.
HE - RUN A MAROTHON TWICE (+)
HE'S RUN A MARATHON TWICE.
HE - GO TO BED
HE'S GONE TO BED.
SHE - COME HERE ONCE (+)
SHE'S COME HERE ONCE.
I - BE TO FRANCE 3 TIMES
I'VE BEEN THERE 3 TIMES
THEY - SWIM IN THAT RIVER. (-)
THEY HAVEN'T SWUM IN THAT RIVER.
I - READ THAT BOOK (-)
I HAVEN'T READ THAT BOOK.
HE - EAT JAPANESE FOOD (-)
HE HASN'T EATEN JAPANESE FOOD
HE - READ THIS BOOK TWICE (+)
HE HAS READ THIS BOOK TWICE