Question

How does shakespeare hope his dear friend to enjoy immority?

Answer 1

Shakespeare says that his best friend will enjoy immortality when her memories will be recorded by the poet through his sonnets, as poetry cannot be destroyed by any means of time. And that's how his friend will enjoy everlasting sonnet through the sonnet about him. 
Hope that helps you!!

Answer 2

Time is great destoryer It tarnishes the memory,object spoil their appeal war is another destroyer.The weapon of war spread destrution but his friend will enjoy everlasting memory through sonnet about him