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19. The error in this sentence is Richards'.
20. The error in this sentence is dogs's.
20. The error in this sentence is dogs's.
The error in apostrophe use is Richards and dogs's.
What is apostrophe?
An apostrophe is a type of punctuation mark that is used in a sentence.
It is used to point out the owner of a thing or show that a belonging for an individual.
Example is Bola's book.
Therefore, the error in apostrophe use is Richards and dogs's.
Learn more on apostrophe here,
https://brainly.com/question/954915
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