Yes, example: Because of heavy rain, the swollen river flooded the village during the night.
No
yes as you proceed into the building, be sure to drop off your papers.
You can, but it is considered improper grammar. Teachers don't like it when you do.
Yes, because "after" is a word that can begin a dependent clause. For example: After I passed all of my exams, I was able to graduate. After looking at the shirts, she selected one with blue stripes. (A dependent clause that begins with "after" needs an independent clause to complete it; the independent clause tells what happened next.)
Yes, you can use next at the start of a sentence. Next week will have good weather. Next year they are going to Spain for their holidays. Next, put the flour into the pot and stir.
No it won't, unless it is at the start of a sentence.
No, because "and" is a conjunction, which is a word that puts together phrases and clauses to create a sentence.
No, because "and" is a conjunction, which is a word that puts together phrases and clauses to create a sentence.
You can start by learning proper grammar. Then she will probably talk to you.
No, a sentence can begin with any kind of word. The first letter of a sentence is always capitalized to mark the start of the individual sentence, not because the word is a proper noun.
Before you start a corporation, learn proper grammar.
You can start a sentence with such as, but it is not considered correct grammar to do so. Try rearranging your sentence so that such as is in the middle.