Read this quotation when i do count the clock that tells the time. why is this verse an example of iambic pentameter?

It has five metrical feet that each contain an unstressed syllable immediately followed by a stressed one.

Iambic pentameter is a meter that follows a specific structure of 5 iambs. Pent = Five. An iamb is an unstressed syllable then a stressed syllable. These two syllables make up a foot. This set of five feet equals 10 syllables all together. This line from Shakespeare's sonnet has 10 syllables in a pattern of unstressed then stressed syllables.

the answer is: apostrophe and allusion.

apostrophe refers to a poetic technique that is used to address an absent individual or an abstract idea/being. allusion on the other hand is a poetic technique that being done by making an indirect reference to other person with a high level of significance (could be historically or culturally significant)