How do you change noun phrases to possessive form?

A noun phrase is a group of Words based on a noun that function together as a noun in a sentence.

Examples:

My bicycle is new. (the noun phrase 'my bicycle' as the subject of the sentence)

I bought my bicycle at Sears. (the noun phrase 'my bicycle' as the direct object of the verb 'bought')

A possessive noun is formed by adding an apostrophe s ('s) to the end of a noun, or just an apostrophe (') the the end of a plural noun that already ends with an s.

Examples:

My bicycle's tire is flat. (the noun phrase 'my bicycle's tire' is the subject of the sentence)

I can fix my bicycle's tire myself. (the noun phrase 'my bicycle's tire' is the direct object of the verb 'can fix')