no
Yes, you would typically use a comma before the word "and" in a series of names. For example: "I invited John, Sarah, and Alex to the party."
No. After the word and comma can not be used, as it is grammatically inappropriate to use comma after conjunctions such as and, which are called coordinate conjunctions.
There is no word in English that necessarily requires a comma.
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No, don't use a comma after "and" in a series. There are two acceptable comma styles for series. One includes a comma before the final "and" (red, yellow, and blue). The other does not include the final comma (red, yellow and blue).
Not necessarily. There is no word in English that requires a comma.
NO
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.
no
no
No.
No