
Unlike the coordinating conjunctions “and,” “but” and “so,” “however” requires a full stop, not just a comma.
Correct Examples:
1. I would attend the event. However, I am too busy. (Note the period before, and the comma after “however.”)
2. I would attend the event; however, I am too busy.
3. I would attend the event. I am too busy, however. (Note the comma before “however.”)
4. I would like to attend the event. According to my assistant, however, I am too busy. (Note that “however” is set off by commas.)
Incorrect Example:
I would attend the event, however I am too busy. (Note that “but” would work in this case.)
Really picky stuff:
Remember that “however” also can mean “whatever way.” In this case, the above rules do not apply.
Example: However you prefer to repay your loan is fine with me.