When the subject is certain creation (created in the past) where there cannot be changes, like:
The published book / The proposed plan / The play "Romeo and Juliet" / The poster that won the 2014 best poster award / The song "Candle in the wind" written by Elton John etc.
and the VERB refers to something in the subject that will not change (examples of the verbs are
contains / explains / covers / features / describes etc. )
should present tense be always used? Any exceptions?
The following are scenarios I can think of and what tenses I consider correct.
(1) The old book describes how to use Microsoft Word 97.
(2) The proposed plan is lengthy and covers many unnecessary details.
(3) The proposed plan contains useful information about the cost and manpower needed.
(4) The poster that won the 2014 best poster award features different types of concerts held in that year.
(5) The song "Candle in the wind" written by Elton John includes the lyrics “xxx xxx".
(6) The book explains why the author disliked cats.
(7) The book is / was / will be very helpful to teenagers (connection with something external, so the tense varies)
(8) The book became / has become / will become very popular (connection with something external, so the tense varies)
I will appreciate any answers to my questions. Thanks a lot.