"The book is printed in China."
Translation:Boken är tryckt i Kina.
"Bli" is infinitive so the corresponding form ("är" is present tense) would be "blir". "Boken blir tryckt i Kina" means it will be printed in China. Another way of using "bli" would be to use past tense - "boken blev tryckt i Kina" - the book was printed in China; as opposed to the original "the book is printed in China.
tryckas is the infinitive passive, trycks is the present tense, and tryckt the participle.
This sentence is boken trycks... A prior sentence was tidningarna trycks... Trycks doesnt change for singular/plural?