However

The phrase "However" in English grammar can function as:

 * An adverb:

   * To introduce a contrasting idea or statement:

     * "The weather forecast predicted rain. However, the sun shone brightly all day."

 * A conjunctive adverb:

   * To connect two independent clauses:

     * "I tried to fix the problem myself. However, I had to call a professional."

     * Note: When used as a conjunctive adverb, "However" is usually followed by a comma.

Key points about using "However":

 * Placement:

   * As an adverb: Can be placed at the beginning, middle, or end of a sentence.

   * As a conjunctive adverb: Usually placed at the beginning of the second independent clause.

 * Punctuation:

   * As an adverb: Usually no comma is needed.

   * As a conjunctive adverb: Always followed by a comma.

I hope this helps! Let me know if you have any other questions.