3.
A: a bag, a pencil -case, a cell phone, a copy book, a book.
An: an umbrella , an apple, an eraser, an orange, an English dictionary .
4.
b) Those are my friends over there.
c) This is your hat here.
d) These are his shoes.
e) Those are her children.
f) This is my dog in the garden .
g) Those are our classmates over there.
h) That's your phone.
i) This is my friend.