Choose which part of speech the underlined part belongs to:

I have your pen.

The correct answer is Adjective

Key Points

• As we have to identify the part of the speech of the word, we need to know the significance of the parts of the speech.
• Parts of speech:
  • A category to which a word is assigned in accordance with its syntactic functions. 
  • In English, the main parts of speech are noun, pronoun, verb, adjective, adverb, preposition, conjunction, and interjection.

Important Points 

• ​In the given question "your" is describing the pen therefore it is an adjective. 
• Let's understand the definitions of parts of speech given in the options:
   

  Parts of speech	Function	Example
  Noun	It is the name of a person, place, animal, feeling, etc.	Ram is a good boy. Meena is studying
  Pronoun	To replace a noun to avoid repetition.	Shalini is Intelligent. She can stand first.
  Verb	It is the word that expresses the action word in the sentence.	Let's work hard. It is very competitive.
  Adjective	It is used to qualify the noun or the pronoun in the sentence.	Khushbu is an intelligent girl. She is a nice girl.

• Since we see 'your' we might think that it is a pronoun.
• But we should be careful here, and realise that 'your' is qualifying the noun pen. 
• From the above table, we find that an adjective is used to qualify the noun in a sentence. 
• Therefore it is an adjective and not a pronoun. 

Thus the correct answer is Option 4