was - were ?

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the boy
I
Tim
she
they
the children
Mrs White
my friend Tony
these books
the Simpsons
you
our teacher
Henry
the butler
the cook and the maid
Lord and Lady Brown
I
you
Sam and you
it
our house
the clock
my last test
last Sunday
Jimmy and Sarah
Sarah and Joe
they
you
my best friend
the girls
those dogs
his maths teacher
Tony and you
my parents and I
that dress
we
you
Fluffy the dog
they
my doctor
the boys
this mobile
Fido
Kenny and Jim
we
you and I