which one is grammatically correct?
"one of the main topics
was
the
parts of..."
or
"one of the main topics
were
the parts of..."
"one of the main topics
was
the
parts of..."
or
"one of the main topics
were
the parts of..."
Anonymous
ONE [of the main topics] WAS the parts . . .
The verb agrees with the subject, not with the predicate noun.
busterwasmycat
one was. and always will be.
robert2020
Was. The topic was singled out. ONE of the main topics 'was'.....
geezer
''ONE of the main topics WAS'' .... Singular
It would be ..
''The main topics WERE'' ............. Plural
OTTO
Was/were refers to "one." Therefore the answer is "was" ( one was, not one were).