While some style rules prohibit it, it is completely fine to begin a phrase with "but" while writing. By all means, begin sentences with "but," but keep in mind that "but" also belongs after a comma. If you want to get technical about it, "but" is an interjection so it cannot stand by itself and must be followed by a noun or a verb.
Yes. Although, starting a phrase with "however" is absolutely appropriate. Indeed, beginning a statement with "although" should be encouraged rather than discouraged. Using "however" to begin a sentence is common and natural.
The most common question I receive regarding however is whether it is OK to use however at the beginning of a phrase, and the answer is yes: it is acceptable to begin a sentence with however. You just must understand when to use a comma and when to use a semicolon. Commas are used to separate items in a list or series. However, if you want to make your sentence more dramatic or explanatory, you can include a colon instead: However; thusly.
Yes, the answer is yes. Starting sentences with the conjunctions "and" or "but" is totally acceptable. It is, nevertheless, a little casual. If you want to be more formal, use a more formal language.
If you want to sound more formal, then omit these words from your first sentence.
Conjunction terms like these link sentences, clauses, or phrases together. However, there are situations when it is preferable to use a different term, such as. "When I use and, I am making a list." "But" can be used to indicate a contrast. "She is old and ugly" vs. "He is young and good-looking." "Or" indicates an option.
When writing a compound sentence, use a semi-colon (;) before and a comma (,) after. If "however" is used to start a sentence, it must be followed by a comma, and what follows the comma must be a complete sentence. Using yet as an introductory word does not require a comma after it.
Many individuals have been taught that starting a sentence with a conjunction is incorrect, however practically all major style guides agree that it is acceptable. Although many individuals were taught not to begin a sentence with a conjunction, all major style guides indicate it is acceptable. The only time I would avoid this pattern is if I was trying to create a very formal tone.