They are all right except the first one. All I know is that the first one isn't cavaliers.
The two plural or possessive errors are the following;
<h3>What are the two plural or possessive errors?</h3>
The two plural or possessive errors are the ones that use the wrong placement of the apostrophe and the letter s. In the instances above, we can see that there was no need for the apostrophe after the letter s in the word, Bird-watchers.
Also, in the second instance, there was a need to put the apostrophe after the letter d in the word, Birds. The correct ways to write these are Bird-watchers and 'The bird's...' So, the two words identified above are the errors.
Learn more about possessive errors here:
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A complex sentence: consisting of many different and connected parts.
Homer’s epic the Odyssey was originally composed in Greek . Which meter was used to give a rhythm to the epic poem ?