b. ARE/AM they here? No, they NOT/AREN'T.
ARE - AREN'T
a. AM/IS she your sister? Yes, she AM/IS.
IS - IS
d. AM/ARE I in this class? Yes, you ARE/AREN'T.
AM - ARE
e. ARE/IS the dictionaries next to the notebooks? No, they IS/AREN'T.
ARE - AREN'T
c. ARE/IS this my pen? No, it ISN'T/AM.
IS - ISN'T
f. ARE/IS the teacher near the door? No, he IS/ISN'T.
IS - ISN'T