Hi !!
I think something is missing in your choices
Some people / are / kind / to others. ► S - LV - PA
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subject = some people
linking verb = are
predicate adjective = kind
to others = IO (indirect object)
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S- V - IO - DO ==> "kind" isn't an Indirect Object; "to others" isn't a direct object
S - V - DO => "kind to others" isn't only a direct object
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Hope I'm right ☺☺☺
