Just depends on what kind of sentence you are saying, but yes because valedictory means a farewell speech or saying goodbye.
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.
It depends on how you use it. If you end a sentence with the word at, it is a dangling participle.
When i use force in a sentence i end it with a exclamation mark.
In most sentences, at the end.
Before is a preposition, so it's grammatically incorrect to use it as the last word in a sentence.
Yes. There is no word or phrase in English that cannot begin or end a sentence.
When he looked at me I looked back.
chicken fudged leg foot
Yes. There is no word or phrase in English that cannot begin -or end - a sentence.
you put an s, you put an s at the end
The applause grew as the concert came to an end.
It was a political decision to end the War in Iraq.