Alot of people find saying the word with the appropriate action works well. Like Donna said, just talk to the bird as you would a person. Repeat only the words you want them to learn with the actions. But if your out alot, there are alot of products on the market for recording yourself. Or I sometimes just leave a song on repeat (usually the cuppycake song or you are my sunshine lol) or the tv.
My 2 don't talk very clearly but then not every bird will talk so I'm not fussed about them not talking.
Yodas started copying the dog downstairs after I repeat myself a million times a day.

Jibbys fave word is 'Chickieeee!' and now Yoda has copied it. (Chicky was the name of a tiel we had when Jibby was a baby 6 years ago!) So when one starts saying 'Chickiee Yeeeah!' The other repeats it. They've pretty much learnt things of anything but me! Either I'm doing something wrong or they are just not interested.

lol
I hope it all works out for you. Goodluck!