hoy hicimos una la siguiente conversacion:
esta conversacon en singular

a)hello. this is patty.
is janet there?
b)no. she isn't. she's at the bank.
a)oh. i see. i'll call back later. thanks.

y esta otra conversacion en plural.

a)hello.this is bobby
are timmy and billy there?
b)no,they aren't.they're at the library.
a)oh, isee. i'll call back later thanks.