Twice, with a comma before and between, like this: The frumpy lecturer went boringly on and on ad infinitum and even beyond, etc, etc.
Actually it should look like this (cars, airplanes, trains, etc.). But if the sentence ends with an abbreviation, the single period will serve to end the sentence, as in cars, airplanes, trains, etc. You do not use double periods. You can, however, use a question mark or exclamation point after a period that ends a sentence. Were you talking about cars, airplanes, trains, etc.? If this looks unusual, it is because abbreviations, such as etc., are generally avoided at the ends of sentences.
Like this: I reject to etc etc etc
they are just there to help you start off or end a sentence
Yes you do.
Verbs don't come at the end of a complete sentence. If you have a command like -- Sit down! -- then this sentence consists of a verb only.
You can end a sentence with a period.Hey, end it with an exclamation mark!What was the question?
to be with
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.
Actually it should look like this (cars, airplanes, trains, etc.). But if the sentence ends with an abbreviation, the single period will serve to end the sentence, as in cars, airplanes, trains, etc. You do not use double periods. You can, however, use a question mark or exclamation point after a period that ends a sentence. Were you talking about cars, airplanes, trains, etc.? If this looks unusual, it is because abbreviations, such as etc., are generally avoided at the ends of sentences.
Well it would be a fragment (a run on sentence, no period, no end, etc).
u use a period and a concluding last sentence
"Etc" will usually come at the end of a list, so no. I believe that it is optional to put a period after it if it is not at the end of a sentence.
Like this: I reject to etc etc etc
No. You can never end a sentence with a preposition. Prepositions relate to place and/or time, examples being words like "at", "on", "in", "under", "during", "with", "while", etc.
One period. The period in etc. also functions as the period for the end of the sentence.
No. When you end a sentence that way you don't have a proper end. At "what" or "where" is left out. Your "at" needs a direct object.
No, you do not put an extra period after "etc." since the period at the end of "etc." serves as the ending punctuation for the sentence.