Helping 20 month old talk?

Patch • First they`re sour then they`re sweet.
Okay so does anyone know how I can help/teach my 20 month old to use words rather than grunts, stomps,& hand signals? 
She started out okay with a few small words & head nods but now she doesn't do it anymore. I want to help her but I don't really know how.

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