No, a comma does not go before the word 'in'.
Not necessarily. There is no word in English that requires a comma before or after it.
no
Before
Not necessarily. Commas are a feature of sentence structure. There is no word or phrase in English that requires a comma.
no
yes
The comma goes before the word "but." For example: I was going to spell the word "comma" right, but then I fell into a coma.
Not necessarily. There is no word in English that requires a comma before or after it.
It is usually appropriate to place a comma before "but." One should not use a comma after "but."
There is no word or phrase in English that requires a comma. Sometimes a comma may go before the word but, for example if it introduces a new thought: We went straight home, but there were interruptions along the way. And sometime a comma may go after the word but: Time is money. But, as we often remind ourselves, all work and no play makes Jack a dull boy. Some people might try to put the comma after, but it comes before.
Yes, you can use a comma before the word "but" when it connects two independent clauses. For example: "I wanted to go to the store, but it started raining."
A comma may go before or after, or not be there at all. The placement of commas is entirely a matter of sentence structure. There is no word in English that requires a comma.