No, it's not improper.
Therefore, because it is not improper, one may begin a sentence with "therefore."
No, it's not improper.
Yes. There is no word or phrase that cannot begin an English sentence. For example: "However you slice it, this was a victory for our side." But when however means "all that other stuff notwithstanding," and is followed by a comma, good stylists do not begin a sentence with it.
this is not an improper sentence.
Starting a sentence with "for" is not necessarily improper, but it may make the sentence sound more formal or structured. It can be used to introduce a reason or explanation in the sentence. However, overusing it may affect the flow of the writing.
However is like but, and you can properly begin a sentence with it!
Understand the definition - improper means not proper. Then make a sentence When that kid sneezed, it was improper of him to not cover his mouth
It was quite improper for you to ask such a question.
"That was improper behavior" "Its quite improper to invite your self over"
I hope this is not an improper answer. Is this suit improper for the dance? Was the response improper?
The subject is improper for this forum. I got a citation for my improper left turn into oncoming traffic.
Typically, a sentence begins with a subject. However there are different constructions that can change that. Take the past two sentences. Both begin with an adjective and an adverb, in essence introductory clauses.