No, not unless the business name is in a published book.
Yes. You would put quotation marks around the name of a game.Examples"Minecraft""Just Dance"
Company names are not underlined, nor are quotation marks put around them. They are written as normal proper nouns unless there are underlines or quotation marks in the name itself.
Quotation Marks
Quotation marks never indicate emphasis. I would leave them off names.
In formal writing, such as academic papers or articles, it is not necessary to put quotation marks around street names. However, in more casual writing or in cases where you want to emphasize the name as a distinct entity, using quotation marks may be appropriate.
Text has to be in quotation marks. If it isn't, it is treated as being the name of something, like a name that has been defined for a range of cells.
No. A newsletter would be either underlined or italicized.
Yes, it is common to put a dog's name in quotation marks when referring to him in a story. This helps differentiate the name from regular text and gives it emphasis as a proper noun.
those are quotation marks
If a proper name or nickname is part of a quote and requires quotation marks, use double quotation marks for the overall quote and single quotation marks within the quote for the proper name or nickname.
You would not need to use quotation marks or need to underline Petronella. It is her name.
No, you underline it. By the way, movie titles are in italics, and songs are in quotation marks.