[lojban-beginners] Sumti from selbri

["Anand Deopurkar" <anand.deopurkar@gmail.com>]

I read that you can make a sumti from a selbri by using "le"
i.e., "le <selbri>" is a sumti meaning "something (that I have in
mind) which fits in the first place of <selbri>. How general is this
procedure of making sumti? In particular, can I convert partial bridi
into sumti using some similar construction?

For example, I can say "mi tcidu le cukta" for "I read a book." What
if wanted to say "I read a book (written) by Tolkien?" In this case,
if will be useful to be able to convert the partial bridi "cukta fi la
tolkin" to something like "le(?) cukta fi la tolkin." I don't think
the usage of "le" here is right but what I wanted to say is "something
that fits in the first place of 'cukta fi la tolkin'.

On a related note, is saying "mi tcidu le cukta pe la tolkin" a good
way to say "I read a book by Tolkien"

Thank you very much,
-Anand