PRESENT S.
1)THEY SELDOM GIVE US THEIR BOOKS.
2)THIS GIRL OFTEN WRITES LETTERS TO HER BOY-FRIEND.
3)WHERE DOES HE WORK EVERY DAY?
PRESENT C.
1)WHAT ARE YOU DOING NOW?
2)HER SISTER IS WRITING A LETTER IN THE GARDEN AT THE MOMENT.
3)I AM OPENING A BOOK NOW.