What is the theme of the poem I Sit By The Fire And Think

I Sit By The Fire And Think is a poem written by J.R.R. Tolkien which present contemplation on the ageing and passing of the time and life.

Explanation:

The poem talks about passing of the time and seasons which writter remebers with saddness and nostalgy. He mourns all missed opportunities, but also those that generations to come will witness but he will miss too. In the end of poem the present comes to his conscious in the shape of friends and family that he gratefully remembers and would like to enjoy while he can.

#1  sara was always tasked with selecting birthday presents for her friends and family because everyone admired her  impeccable taste. 

impeccable (adj): perfect, flawless

#2  they moved to the united states many years ago, but their  insular  attitudes made it difficult for them to socialize. 

insular (adj): isolated; separate

#3  the professor explained the  semantic  relationship between the two nouns used in the sentence. 

semantic (adj): related to words or the meanings of words 

happy to : )

i have a basic answer but if you want a more in depth