* Preposition: This is the most common use. It introduces a phrase that modifies a verb, adjective, or other adverb.
* Example: "Considering the circumstances, he did a good job."
* Gerund: This is a verb form ending in "-ing" that functions as a noun.
* Example: "Considering all the options is essential."
* Participle: This is a verb form ending in "-ing" that functions as an adjective.
* Example: "He gave a considering look."
To determine the part of speech, look at the word's function in the sentence.