* Verb: This is the most common use. It describes the action of making a phone call or summoning someone.
* Example: "I'm calling my mom."
* Noun: It can refer to the act of making a phone call or the process of summoning something.
* Example: "The calling of the troops was a surprise."
* Gerund: It can act as a noun, functioning as the subject or object of a sentence.
* Example: "Calling is the best way to stay in touch."
* Present participle: It can modify a noun or pronoun, describing an action in progress.
* Example: "The calling birds filled the air with song."
To determine the correct part of speech, you need to look at the context of the sentence.