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The entire sentence should be in parentheses, however the portion that is, should contain a period outside of the parentheses.
The end punctuation in a sentence with parentheses depends on the overall sentence structure. If the parentheses contain a complete sentence, the period goes inside the closing parenthesis. If the information in the parentheses is additional or clarifying, the ending punctuation goes outside the closing parenthesis.
Write your sentence (then your parenthetical). Use the same punctuation inside the parentheses as you would outside of them and end the sentence with an ending punctuation mark (period).
No. Typically, you will only put ending punctuation (in this case, a period) if the sentence within the parentheses is a complete sentence.
Yes, you would still put a period at the end of the sentence even if it includes a parenthetical reference. The period indicates the end of the sentence's main thought, and the parenthetical reference is additional information for the reader's benefit.
Use a period inside a parenthetical when the full sentence inside the parentheses ends.
No, if "etc." is at the end of a sentence in parentheses, you only need one period. The period in "etc." serves as the punctuation for the abbreviation, and there is no need for an additional period to end the sentence.
In general, the period goes within the parentheses (I really wasn't sure it was a good idea.) My paranthetical sentence was just an example ... but I am not sure what you mean by imcomplete thought...... then you would end with ...
(If it adds clarity) one may start a sentence with parentheses.
yes
Outside. (But if the entire sentence is a parenthetical like this one, it would go inside.)
No. There is no definitive rule regarding parentheses and end punctuation.Punctuate within the parenthetical as normal, and punctuate the sentence in which the parenthetical occurs as normal as well.