Yes, the three periods are called an ellipsis (...) which is a punctuation used to indicate that a part of a quote is missing. The ellipsis marks the place where the text is absent. For example:
Excerpt from MKL "I Have a Dream..." speech:
"It is obvious today that America has defaulted on this promissory note ..., America has given the Negro people ..., a check which has come back marked 'insufficient funds'."
Ellipsis are also used to indicate an unfinished thought or sentence:
"John said..." "What did John say?"
"John! Do not put lighter fluid on the hot..." "John, John are you OK?"
No, using "period period period" is not grammatically correct. "Period" is typically used to end a sentence or indicate a pause, so repeating it like that does not follow standard grammar rules.
It would not be a complete sentence but, there is nothing inherently grammatically incorrect in the phrase "during the all period". What you have is a reference to a period of time called "the all". Just because nobody knows what "The All" is doesn't make this grammatically incorrect.
Yes, it is grammatically correct to abbreviate "March" as "Mar." for a date, such as Mar. 15th. Just be sure to use the period after the abbreviation to show it is shortened.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, "He sailed his boat on the river" is grammatically correct.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
It would not be a complete sentence but, there is nothing inherently grammatically incorrect in the phrase "during the all period". What you have is a reference to a period of time called "the all". Just because nobody knows what "The All" is doesn't make this grammatically incorrect.
Honda Motors sells cars. correct with a period at the end :)
Yes, but don't forget the period at the end
"Not like that" can be grammatically correct, depending on the context.
The phrase "Is you don't miss me do you" is not grammatically correct. It should be rephrased to something like "Don't you miss me?" to be correct.
Yes! That is grammatically correct!
Yes, 'for free', is grammatically correct.
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
Yes, Almighty God is grammatically correct.
The sentence "Rhoda's Crazy" is not grammatically correct. It is missing a verb to make a complete sentence.