John was hired to be an extra in a movie
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Extra ammo was transported on bandoliers.
They gave the children extra homework to make up for the short day. There was an extra seat at the table.
Extra furniture is sometimes put in storage.
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The dog's eyes seemed to entreat me for an extra helping of dinner.
The advisor advises the student to do extra study, but they didn't listen.
i dont understand this question. but you use it in a list or when you add something extra to your sentence, as long as it makes sence without the extra bit of information.
Use "that" to introduce essential information that is necessary for the meaning of the sentence. Use "what" to introduce non-essential information that adds extra detail but is not crucial for understanding the sentence.
It was nice to be able to invite our neighbor to supper when having extra rice prepared.
I brought some extra money on my trip to buy a souvenir or two.
The extra publicity helped to increase the company's visibility.Foggy days have low visibility.