No, it's not improper.
Therefore, because it is not improper, one may begin a sentence with "therefore."
No, it's not improper.
Therefore, instead of turning at Faber Street, she crossed it.
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.
Yes, you can. Example: Bob is not a human. Therefore, Bob is considered an alien.
Yes, but please spell it right: Therefore.
In formal writing you would not begin a sentence with because, therefore, the kind of sentence that begins with because is informal.
And is a coordinating conjunction; therefore it should never begin a sentence. Ironically, though, the preceding sentence is correct because and is used as a word, not as a conjunction.
Yes. Either a prepositional phrase or a conjunction use of "except" can begin a compound sentence, and should be followed by a comma.Examples:Except for the species in Australia, mammals do not lay eggs.Except during heavy rains, the floodgates are kept open.
Good question, I have been wondering myself. Until recently, yes, it was frowned upon, but in recent text it has become more acceptable; much like the use of beginning a sentence with 'but'. I hope that answered your question.
When used as a verb, begin is plural and begins is singular. This is due to subject verb agreement. One needs only look at a couple sample sentence to see the difference. "He begins work at dawn." "They begin work at dawn." In the first sentence, the subject is singular, and therefore, must have a singular verb, which is begins. In the second sentence, the subject is plural, and therefore, must have a plural verb, which is begin. Essentially, don't let the "s" on the end confuse you. When it comes to verbs, the "s" does not imply plurality.
Yes. There is no word that cannot begin an English sentence.