"In five years, things happened." Yes you do need a comma.
Yes it would.
Yes, when using therefore, use a comma after it.I invited five more girls to my party for a total of ten of us. Therefore, my mother needed to buy more food.I was on vacation, therefore, I could not have started the fire.
$555,222. A tip is that the comma in your number is going to go where the "thousand" is in the sentence. So you know that the five hundred fifty five is going to go before the comma, and two hundred twenty two will go after the comma. That's an easier way to divide it up so it's simpler to write in number form.
45,000- the forty five part is the numbers before the comma. This is a comma , the thousand part means three zeros after the comma.
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The sentence should be corrected to say "I have been a secretary for five years" to properly convey the duration of time the person has been in that role.
Example sentence - I have been the administrator for the program for over five years.
when there about five years old in chimp years
The seller of the video was sentenced to five years in prison.
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There are five nouns:JohnTucsonspeechsubjectdemocracyNote: There should be a comma after the noun subject: ...his favorite subject, democracy.
Five thousand and thirty in numbers is 5,030. The comma is optional.