In general, yes.
For example, "The seller, Mary Smith, lives at 1234 Main Street."
In many cases, the word 'however' is followed by a comma. The problem with the word is that one must be careful not to over use a comma. However the word is used,(note that there is no comma used in this connection) the word itself frequently does not need a comma as an automatic punctuation.However, (meaning 'on the other hand') phrasing will most often determine if the word is followed by a comma. These two instances here are examples of when to use or not use the comma as punctuation for this word. When the word is used as a substitute for the phrase 'on the other hand', it is most often followed by a comma.
The comma goes before the word "and" when you are separating two independent clauses in a sentence. For example: "I finished my work, and then I went home."
No, it's not improper.
Usually not, but it depends on context. There are no words that are always followed by a comma. You should concentrate on the use of verbs for a while.
No. There is no rule that a comma must always follow the word "which." In a parenthetical or appositive phrase, however, a comma may be required.Example:I did what I thought was right which, as I came to find out, was not.
You can put a comma before or after just about any word if the sentence structure requires it. If the sentence structure does not require it, it may be permissable to use a comma to assist in clarity and avoid confusion. Otherwise, don't use a comma. Have I confused you yet? Using a comma does not depend on the word, it depends on the structure of the sentence.
The comma always goes after the name in the beginning of a letter.
Yes, in a formal letter or email, the comma is placed after the word "sincerely" before your name. For example: Sincerely, [Your Name].
You should have put the word 'or' in inverted commas, followed by a comma, or you might be misunderstood due to mistakes in punctuation!
In a company name such as "ABC Corp," do not use a comma. However, use a comma in the formulation, "ABC, Inc."
Generally, no, unless the word "which" is followed by a parenthetical expression or phrase separated from the rest of the sentence by commas.
No, a comma does not go before the word 'in'.