Do you use a comma before the word however at end of sentence?

You don't use a comma before the word "however" at the end of a sentence.

Here's why:

* "However" as a conjunctive adverb: When "however" is used to connect two independent clauses, it should be preceded by a semicolon.

* Example: "The weather was terrible; however, we still had a great time."

* "However" at the end of a sentence: When "however" is used at the end of a sentence, it is simply an adverb modifying a previous phrase or clause. It doesn't need a comma before it.

* Example: "We were hoping for a sunny day. It was raining, however."

In short, the placement of a comma before "however" depends on its grammatical function. It needs a semicolon when it connects two independent clauses, but not when it's at the end of a sentence.