Inserting possessive apostrophe

VoiceIn sometimes (but not always) adds the possessive apostrophe when the noun is singular (“a student’s grades”) but doesn’t ever seem to insert it when the noun is plural (“first-year students’ grades”). I tried adding a custom voice command to add the apostrophe, but when I use the command, it inserts the punctuation mark with spaces around it (“first-year students ’ grades”). Is there any way to automate possessive apostrophes more effectively?

What voice command did you add?

I tried students => students’ . It works fine.

I tried apostrophe=>'. VoiceIn doesn’t seem to know when to insert the possessive apostrophe or when to use the simple plural. Sometimes I need to say a plural work such as “students” without the apostrophe, so the above command wouldn’t work for that purpose. I’m not sure how to add a custom command that appends the apostrophe when a plural word is posessive without it adding the space in between.

Try adding
students apostrophe => students’

The problem is we format text treating ’ as a single quote. You will need to use a command of the form above to achieve your desired result.