According to Arlov Grammatically

Many instructors urge their students not to start their sentences with the word still, or any other coordination conjunction for that matter. This can be disheartening for students because we commonly speak with our sentences beginning with a conjunction. However, writing is not like speaking. at that place are two schools of thought on beginning a sentence with the word, but. According to Arlov, Grammatically, it is correct to start a sentence with but or any other FANBOYS conjunction.However, your instructors may discourage the practice for two good reasons (343). She goes on to list the reasons. One good reason not to begin a sentence with the word but is because it is informal and casual. Academic writing is not usually casual or informal, and using but at the beginning of a sentence may make a more formal paper appear less than well thought out.While it is OK for some sorts of writing such as narrative or dialog, a professional paper is seldom written with coordination conjun ctions at the beginning of sentences. Also, using words like but is addictive It is easy to use and overuse. Arlov advises using conjunctions to begin sentences sparingly so as not to make it a hard habit to break. The other side of the roll in the hay says using but is just like using any other word to begin a sentence, and therefore, there is nothing wrong with it.