One period.
To answer your question. You will have to put TWO periods.
The starting AND ending of your periods. :)
No, there should not be two periods when "am" is at the end of a sentence. Only one period is needed to end the sentence.
No, it is not necessary to end a sentence with two periods if the sentence ends with an abbreviation like "M.D." One period at the end of the abbreviation is sufficient for proper punctuation.
no, there is only one. ================== I can't think of any example where ending a sentence with two periods would be necessary. Not even following the last word in a sentence that is being quoted within parentheses would I expect one to employ two periods. One, I humbly submit, is all that's ever needed. ------------------------- Placing more than one punctuation mark at the end of a sentence is superfluous. It is a rule of punctuation that there be only one form of "end punctuation" to a sentence. Whether the end punctuation be a period, question mark or exclamation point, only one is required. The rule applies also when the punctuation mark appears within parentheses or quotation marks; a second punctuation mark is both unnecessary and inappropriate.
One period. The period in etc. also functions as the period for the end of the sentence.
It depends on what your opening sentence was. Your ending sentence should follow the logic of the opening one, and should summarize what you wrote in your paragraph or essay. Click the link to learn how to write essays.
If a sentence ends with an abbreviated word then only one period (full stop) is used.
An ending element is one that is used to signal the end of something. For example, the ending element of a sentence is a period, and the ending element of an HTML page is the greater than sign (>).
You can say, "With whom did he leave"
Yes, you need to put two periods after every sentence. When you publish a book, write an essay or most other publishable things you need two periods.
Behold ! Awake ! Stop ! Hey ! Go . only one word, then an ending mark